Microbiology Trivia Questions Quiz!

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  • 1/83 Questions

    Which are of microbiolgy studies fungi?

    • Mycology
    • Parasitology
    • Biotechnology
    • Immunology
    • Bioremediation
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About This Quiz

The study of microbiology covers the area of science that deals with microscopic organisms, best defined as organisms so small that you typically cannot see them with the naked eye. Can you identify the different kinds of microorganisms out there – bacteria, fungi, protozoa, viruses – and tell us all about them and how they’re studied? Take the following quiz See moreto find out just how much you know about them! Good luck!

Microbiology Trivia Questions Quiz! - Quiz

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  • 2. 

    Which of the following statements about bacteria is not true?

    • Bacteria are essential to the presence of life on Earth

    • Everyone has bacteria in and on his body

    • Bacteria are used to make some foods

    • The only good bacterium is a dead bacterium

    Correct Answer
    A. The only good bacterium is a dead bacterium
    Explanation
    The statement "The only good bacterium is a dead bacterium" is not true. While some bacteria can cause diseases, many bacteria are beneficial and necessary for various ecological processes and human health. For example, bacteria help in digestion, produce vitamins, and play a crucial role in the nitrogen cycle. Therefore, it is incorrect to claim that the only beneficial bacterium is a dead one.

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  • 3. 

    At which growth temperture bacteria grow at the fastest rate?

    • Maximum temperature

    • Optimum temperature

    • Minimum temperature

    Correct Answer
    A. Optimum temperature
    Explanation
    Bacteria grow at the fastest rate at their optimum temperature. This temperature is the ideal condition for their growth and metabolism. At this temperature, all the necessary enzymes and cellular processes occur at their maximum efficiency, allowing bacteria to multiply rapidly. Temperatures above or below the optimum can slow down or inhibit bacterial growth, as enzymes may become denatured or metabolic processes may become too slow. Therefore, the optimum temperature is where bacteria can grow at their fastest rate.

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  • 4. 

    Which of the following pairs is mismatched?

    • Leeuwenhoek - microscope

    • Pasteur - proof of biogenesis

    • Jenner - vaccination

    • Koch - aseptic surgery

    Correct Answer
    A. Koch - aseptic surgery
    Explanation
    The given pair "Koch - aseptic surgery" is mismatched because Robert Koch is known for his contributions to microbiology, particularly in the field of bacteriology. He developed techniques to isolate and identify bacteria, formulated Koch's postulates to establish the causative relationship between a microorganism and a disease, and discovered the bacteria responsible for diseases such as tuberculosis and cholera. Aseptic surgery, on the other hand, refers to the practice of performing surgical procedures in a sterile environment to prevent infection, which is not directly associated with Koch.

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  • 5. 

    Which of the following mechanisms requires energy?

    • Simple diffusion

    • Osmosis

    • Facilitated diffusion

    • Active transport

    Correct Answer
    A. Active transport
    Explanation
    Active transport is the only mechanism among the options that requires energy. Active transport is the movement of molecules across a cell membrane against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires the use of energy in the form of ATP (adenosine triphosphate) to pump the molecules against the concentration gradient. In contrast, simple diffusion, osmosis, and facilitated diffusion are all passive mechanisms that do not require energy as they involve the movement of molecules along their concentration gradient.

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  • 6. 

    The appearance of gram-negative bacteria after completing Gram stan is:

    • Red

    • Brown

    • Purple

    • Colorless

    Correct Answer
    A. Red
    Explanation
    After completing the Gram stain, gram-negative bacteria appear red. This is because the Gram stain procedure involves the use of crystal violet dye, iodine, alcohol, and safranin. Gram-negative bacteria have a thinner peptidoglycan layer in their cell walls, which allows the crystal violet dye to be easily washed away by the alcohol. As a result, the safranin counterstain is taken up by the gram-negative bacteria, causing them to appear red under a microscope.

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  • 7. 

    What color should a gram-positive organism appear after Gram stain

    • Pink

    • Red

    • Green

    • Purple

    • Orange

    Correct Answer
    A. Purple
    Explanation
    Gram-positive organisms should appear purple after a Gram stain. This is because the Gram stain procedure involves the application of crystal violet dye, which stains the peptidoglycan layer in the cell wall of bacteria. Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet dye, causing them to appear purple under a microscope.

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  • 8. 

    The most common solidifying agent added to culture media is:

    • Starch

    • Silica gel

    • Gelatin

    • Agar

    Correct Answer
    A. Agar
    Explanation
    Agar is the most common solidifying agent added to culture media. Agar is a gelatinous substance derived from seaweed and has the ability to form a solid gel at a temperature range suitable for microbial growth. It is widely used in microbiology laboratories because it is inert, transparent, and can be easily sterilized. Agar provides a solid surface for the growth of microorganisms, allowing them to form distinct colonies, facilitating their isolation and identification. It also has the advantage of being resistant to degradation by most microorganisms, making it an ideal solidifying agent for culture media.

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  • 9. 

    Cocci are:

    • Round to oval bacteria

    • Rod bacteria

    • Cylindrical shape bacteria

    • Bacillus type bacteria

    • Spiral

    Correct Answer
    A. Round to oval bacteria
    Explanation
    Cocci are round to oval bacteria. The term "cocci" refers to a specific shape of bacteria, which is spherical or oval in appearance. This shape is characteristic of certain types of bacteria, such as Staphylococcus and Streptococcus. The other options mentioned in the question, such as rod bacteria, cylindrical shape bacteria, and bacillus type bacteria, do not accurately describe the shape of cocci bacteria. Spiral bacteria, on the other hand, have a corkscrew-like shape and are not considered cocci. Therefore, the correct answer is round to oval bacteria.

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  • 10. 

    You can find nucleotides in

    • DNA

    • Amino acids

    • Fatty acids

    • Proteins

    • Carbohydrates

    Correct Answer
    A. DNA
    Explanation
    Nucleotides are the building blocks of DNA, which is a molecule that contains the genetic instructions for the development and functioning of all living organisms. DNA is made up of a long chain of nucleotides, each consisting of a sugar molecule, a phosphate group, and a nitrogenous base. Nucleotides are not found in amino acids, fatty acids, proteins, or carbohydrates.

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  • 11. 

    Place the following steps in the correct sequence: 1 - Staining; 2- Making a smear; 3 - Fixing

    • 1-2-3

    • 1-3-2

    • 3-2-1

    • 2-3-1

    Correct Answer
    A. 2-3-1
    Explanation
    The correct sequence for the given steps is 2-3-1. First, making a smear is done to prepare a thin layer of the sample on a slide. Then, fixing is performed to kill the microorganisms and attach them to the slide. Finally, staining is carried out to enhance the visibility of the microorganisms and differentiate them from the background.

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  • 12. 

    Cell division occurs in prokaryotes by:

    • Budding

    • Meiosis

    • Binary Fission

    • Mitosis

    Correct Answer
    A. Binary Fission
    Explanation
    Binary fission is the correct answer because it is the process of cell division in prokaryotes, such as bacteria. In binary fission, the parent cell divides into two identical daughter cells, each containing a copy of the parent's DNA. This process is different from meiosis, which is a type of cell division that occurs in eukaryotes and involves the formation of gametes. Budding is a form of asexual reproduction seen in some organisms, but it is not the primary method of cell division in prokaryotes. Mitosis is a type of cell division that occurs in eukaryotes and is not relevant to prokaryotes.

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  • 13. 

    Proteins are formed by amino acids connected by:

    • Alpha 1,4-glycosidic bond

    • Phosphodiester linkage

    • Hydrogen bonds

    • Peptide bonds

    Correct Answer
    A. Peptide bonds
    Explanation
    Peptide bonds are formed between amino acids to create proteins. These bonds occur through a condensation reaction, where the carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule. This process is repeated to form a chain of amino acids, which then folds and interacts with other molecules to create a functional protein. Peptide bonds are essential for the structure and function of proteins, as they determine the sequence and arrangement of amino acids in the protein chain.

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  • 14. 

    Which of the following is not a kingdom in the five-kingdom system?

    • Animal

    • Fungi

    • Monera

    • Plant

    • Virus

    Correct Answer
    A. Virus
    Explanation
    The five-kingdom system categorizes organisms into five kingdoms based on their characteristics and evolutionary relationships. The kingdoms are Animal, Fungi, Plant, Protista, and Monera. However, viruses are not considered as a kingdom in this system because they are not living organisms. Viruses are acellular and cannot carry out metabolic processes on their own. They require a host cell to reproduce and are considered as infectious agents rather than living organisms.

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  • 15. 

    These are the primary molecules making up plasma membrane in cells

    • Nucleic acids

    • Carbohydrates

    • Proteins

    • Lipids

    Correct Answer
    A. Lipids
    Explanation
    The primary molecules making up the plasma membrane in cells are lipids. Lipids are a diverse group of molecules that include fats, oils, and phospholipids. They are hydrophobic, meaning they repel water, which makes them ideal for forming the structure of the plasma membrane. The lipid bilayer is formed by two layers of phospholipids, with their hydrophilic heads facing the watery environment inside and outside the cell, and their hydrophobic tails facing each other in the middle. This arrangement provides a barrier that controls the movement of substances in and out of the cell, making lipids essential for maintaining cell integrity and function.

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  • 16. 

    This microscope is used to observe a specimen that emits light when illuminated with an ultra violet light and is an excellent diagnostic tool.

    • Electron microscope

    • Compound light microscope

    • Fluorescence microscope

    • Darkfield microscope

    Correct Answer
    A. Fluorescence microscope
    Explanation
    A fluorescence microscope is the correct answer because it is specifically designed to observe specimens that emit light when illuminated with ultraviolet light. This type of microscope is commonly used in diagnostic applications because it allows for the visualization of fluorescently-labeled molecules or structures within the specimen. The emitted light provides valuable information about the presence and location of specific molecules or cellular components, making it an excellent tool for diagnostic purposes.

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  • 17. 

    Identify the FALSE statement.

    • The cell wall of G+ is much thicker than G-

    • In Gram stain, G- are blue (purple) and G+ are pink (red)

    • G+ and NOT G- contain teichoic acid in their cell wall

    • In Gram stain, G+ are blue (purple) and G- are pink (red)

    Correct Answer
    A. In Gram stain, G- are blue (purple) and G+ are pink (red)
  • 18. 

    This is not an internal structure of a bacteria

    • Ribosome

    • Plasmid

    • Fimbriae

    • Nucleoid

    Correct Answer
    A. Fimbriae
    Explanation
    Fimbriae are short, hair-like appendages found on the surface of some bacteria. They are used for attachment to surfaces, including host tissues, and are important for the bacteria to establish infections. In contrast, ribosomes are cellular structures responsible for protein synthesis, plasmids are small, circular DNA molecules that can be found in bacteria and often carry additional genetic information, and nucleoid refers to the region in a bacterial cell where the genetic material is located. Therefore, fimbriae are the only option that does not represent an internal structure of a bacteria.

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  • 19. 

    Which molecule is composed of a chain of amino acids?

    • Carbohydrates

    • Proteins

    • Lipids

    • Nucleic acids

    Correct Answer
    A. Proteins
    Explanation
    Proteins are composed of a chain of amino acids. Amino acids are the building blocks of proteins, and they are linked together through peptide bonds to form a long chain. This chain of amino acids then folds and twists into a unique three-dimensional structure, which determines the protein's function. Therefore, proteins are the molecules that are composed of a chain of amino acids.

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  • 20. 

    What is the purpose of buffer in culture media?

    • To keep bacteria under control

    • To increase pH

    • To decrease pH

    • To separate microorganisms from one another

    • To maintain pH at a certain level

    Correct Answer
    A. To maintain pH at a certain level
    Explanation
    The purpose of a buffer in culture media is to maintain the pH at a certain level. This is important because bacteria and other microorganisms have specific pH requirements for growth and survival. If the pH of the culture media fluctuates too much, it can negatively affect the growth of the microorganisms. Therefore, adding a buffer to the culture media helps to stabilize and maintain the pH at the desired level, providing optimal conditions for the growth and study of microorganisms.

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  • 21. 

    We discussed two processes for synthesizing ATP. Which process requires proton gradient across the membrane?

    • Substrate level phosphorylation

    • Oxidative level phosphorylation

    Correct Answer
    A. Oxidative level phosphorylation
    Explanation
    Oxidative level phosphorylation requires a proton gradient across the membrane. During this process, electrons are transferred through the electron transport chain, which pumps protons from the matrix to the intermembrane space. This creates a proton gradient, and as the protons flow back into the matrix through ATP synthase, ATP is synthesized. Substrate level phosphorylation, on the other hand, involves the direct transfer of a phosphate group from a substrate molecule to ADP to form ATP, and does not require a proton gradient.

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  • 22. 

    This microscope achieves the highest magnification and greatest resolution.

    • Flurorescence microscope

    • Phase-contrast microscope

    • Electron microscope

    • Darkfield microscope

    • Compound light microscope

    Correct Answer
    A. Electron microscope
    Explanation
    The electron microscope achieves the highest magnification and greatest resolution compared to the other types of microscopes listed. This is because it uses a beam of electrons instead of light to magnify and image the specimen. The shorter wavelength of electrons allows for higher resolution, enabling scientists to see smaller details and structures within the specimen.

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  • 23. 

    Nitrogen bases are building blocks of:

    • Lipids

    • Deoxyribose

    • Nucleotides

    • Ribosomes

    • None of these

    Correct Answer
    A. Nucleotides
    Explanation
    Nitrogen bases are the building blocks of nucleotides. Nucleotides are the basic units that make up DNA and RNA molecules. They consist of a nitrogenous base, a sugar (deoxyribose or ribose), and a phosphate group. The nitrogen bases, including adenine, thymine, guanine, cytosine, and uracil, are responsible for the genetic code and the sequence of nucleotides in DNA and RNA. Therefore, the correct answer is nucleotides.

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  • 24. 

    Bacterial cell membrane DOES NOT contain:

    • Phospholipids

    • Proteins

    • Glycoproteins

    • Lipids

    • Nucleic acids

    Correct Answer
    A. Nucleic acids
    Explanation
    The bacterial cell membrane is composed of phospholipids, proteins, and lipids, which are essential components for its structure and function. Glycoproteins are also present in the membrane, serving various roles such as cell recognition and signaling. However, nucleic acids, which include DNA and RNA, are not typically found in the cell membrane. Nucleic acids are primarily located within the bacterial cell's cytoplasm and nucleus, where they play a crucial role in genetic information storage and protein synthesis.

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  • 25. 

    In the name of escherichia coli, coli is the:

    • Specific epithet family

    • Genus

    • Species

    • Kingdom

    Correct Answer
    A. Species
    Explanation
    In the name of Escherichia coli, "coli" refers to the species. The species is the most specific taxonomic rank in the biological classification system. It represents a group of organisms that are closely related and can interbreed to produce fertile offspring. In this case, "Escherichia coli" is the specific species name for a type of bacteria commonly found in the intestines of humans and animals.

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  • 26. 

    Who proved that microorganisms cause disease?

    • Pasteur

    • Van Leeuwenhoek

    • Koch

    • Hooke

    Correct Answer
    A. Koch
    Explanation
    Koch proved that microorganisms cause disease. He was a German physician and microbiologist who developed the germ theory of disease. Koch's postulates, a set of criteria to establish a causal relationship between a microorganism and a disease, became the standard for identifying the causative agents of infectious diseases. Through his research on anthrax, tuberculosis, and cholera, Koch made significant contributions to the field of medical microbiology and laid the foundation for modern bacteriology.

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  • 27. 

    The type of bond holding Na+ and Cl- ions in NaCl is a(n):

    • Covalent bond

    • Double bond

    • Ionic bond

    • Hydrogen bond

    Correct Answer
    A. Ionic bond
    Explanation
    An ionic bond is formed between Na+ and Cl- ions in NaCl. In an ionic bond, one atom transfers electrons to another atom, resulting in the formation of oppositely charged ions. In this case, sodium (Na) loses an electron to become a positively charged ion (Na+), while chlorine (Cl) gains that electron to become a negatively charged ion (Cl-). The strong electrostatic attraction between these oppositely charged ions holds them together in a crystal lattice structure, forming an ionic bond.

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  • 28. 

    A chemical bond formed by two atoms when they share pairs of electrons to fill their outer shells is a/an:

    • Hydrophilic interaction

    • Covalent bond

    • Hydrogen bond

    • Ionic bond

    • Romantic bond

    Correct Answer
    A. Covalent bond
    Explanation
    A covalent bond is formed when two atoms share pairs of electrons to fill their outer shells. In this type of bond, the electrons are shared between the atoms, creating a strong bond. This allows both atoms to achieve a stable electron configuration. Covalent bonds are typically formed between nonmetal atoms and are responsible for holding molecules together. Unlike ionic bonds, covalent bonds do not involve the transfer of electrons. Hydrophilic interaction, hydrogen bond, and ionic bond are not correct answers as they involve different types of bonding mechanisms.

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  • 29. 

    This microscope uses an ultraviolet light source.

    • Dark field microscope

    • Fluorescence microscope

    • Electron microscope

    • Compound light microscope

    Correct Answer
    A. Fluorescence microscope
    Explanation
    A fluorescence microscope is the correct answer because it uses an ultraviolet light source to excite fluorescent dyes or molecules in the sample. This causes them to emit light of a different wavelength, which can be captured and observed. This technique is commonly used in biological research to study specific molecules or structures within cells.

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  • 30. 

    Eukaryotes include all BUT

    • Algae

    • Fungi

    • Plants

    • Animals

    • Bacteria

    Correct Answer
    A. Bacteria
    Explanation
    Eukaryotes are organisms that have cells with a nucleus and other membrane-bound organelles. They include algae, fungi, plants, and animals. Bacteria, on the other hand, are prokaryotes, which means they lack a nucleus and membrane-bound organelles. Therefore, bacteria are not included in the category of eukaryotes.

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  • 31. 

    Which of the following pairs are mismatched?

    • Ehrlich - chemoterarphy

    • Jenner - vaccination

    • Pasteur - proof of biogenesis

    • Koch - aseptic surgery

    Correct Answer
    A. Koch - aseptic surgery
    Explanation
    The given pair "Koch - aseptic surgery" is mismatched. Robert Koch was a German physician and microbiologist who is known for his contributions to the field of bacteriology, including his work on tuberculosis and the development of Koch's postulates. Aseptic surgery, on the other hand, refers to surgical techniques and practices aimed at preventing the introduction of microorganisms into a surgical wound. While Koch made significant contributions to the field of medicine, aseptic surgery is not one of them.

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  • 32. 

    Which of the following is a scientific name?

    • Legionnaires' Disease

    • Legionella Pneumophila

    • Legionnares' bacterium

    • Philadelphia fever

    Correct Answer
    A. Legionella Pneumophila
    Explanation
    Legionella Pneumophila is a scientific name because it follows the proper format for scientific naming, which consists of two parts: the genus name (Legionella) and the species name (Pneumophila). This naming system is used in biology to classify and categorize organisms. In contrast, the other options provided (Legionnaires' Disease, Legionnares' bacterium, Philadelphia fever) are not scientific names as they do not follow the proper naming conventions.

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  • 33. 

    Which of the following chemicals is found only in the outer membrane of Gram-negative bacteria?

    • Plasmid

    • Teichoic acid

    • Flagella

    • Lipopolysaccharide

    • Peptidoglycan

    Correct Answer
    A. Lipopolysaccharide
    Explanation
    Lipopolysaccharide is a chemical found only in the outer membrane of Gram-negative bacteria. It is a unique component of the outer membrane and plays a crucial role in the structural integrity and protection of the bacteria. Lipopolysaccharide also acts as an endotoxin, triggering an immune response in the host organism. This chemical is not present in Gram-positive bacteria, making it a characteristic feature of Gram-negative bacteria.

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  • 34. 

    Which of the following statements are about a gram-negative cell wall is not true?

    • It has teichoic acids

    • It contains an endotoxin

    • It protects the cell from osmotic lysis

    • It maintains the shape of the cell

    Correct Answer
    A. It has teichoic acids
    Explanation
    Gram-negative cell walls do not have teichoic acids. Teichoic acids are a characteristic of gram-positive cell walls. Gram-negative cell walls contain lipopolysaccharides, which are responsible for the endotoxin activity. The outer membrane of gram-negative cell walls provides protection against osmotic lysis. The peptidoglycan layer in the cell wall helps maintain the shape of the cell.

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  • 35. 

    Which one makes the most ATP; aerobic respiration, anaerobic respiration or fermentation?

    • Anaerobic respiration

    • Fermentation

    • Aerobic respiration

    • They all basically make the same number of ATP

    Correct Answer
    A. Aerobic respiration
    Explanation
    Aerobic respiration is the process that produces the most ATP. During aerobic respiration, glucose is broken down in the presence of oxygen to produce a large amount of ATP. This process occurs in the mitochondria of cells and is the most efficient way to generate energy. Anaerobic respiration and fermentation also produce ATP, but in smaller amounts compared to aerobic respiration. Anaerobic respiration occurs in the absence of oxygen, while fermentation occurs in the absence of both oxygen and an electron transport chain. Both these processes are less efficient and produce fewer ATP molecules. Therefore, aerobic respiration is the most effective in generating ATP.

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  • 36. 

    All of the following can be found in mitochondria except:

    • Circular DNA

    • Ribosome

    • ATP-generating mechanism

    • Electron transport system

    • Cell wall

    Correct Answer
    A. Cell wall
    Explanation
    Mitochondria are membrane-bound organelles found in eukaryotic cells and are responsible for producing energy in the form of ATP. They contain their own circular DNA, which is distinct from the linear DNA found in the cell nucleus. Mitochondria also have ribosomes, which are responsible for protein synthesis. The ATP-generating mechanism and the electron transport system are both crucial components of mitochondrial function. However, mitochondria do not have a cell wall. Cell walls are typically found in prokaryotic cells, such as bacteria, and some eukaryotic cells, such as plant cells.

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  • 37. 

    Loss of electrons means:

    • Phosphorylation

    • Reduction

    • Oxidation

    Correct Answer
    A. Oxidation
    Explanation
    Oxidation refers to the loss of electrons from a substance. In this context, when a substance loses electrons, it is undergoing oxidation. Phosphorylation, on the other hand, refers to the addition of a phosphate group to a molecule, and reduction involves the gain of electrons. Therefore, the correct answer is oxidation as it directly relates to the loss of electrons.

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  • 38. 

    The best definition of biotechnology is:

    • The use of living organisms to make desired products

    • Curing diseases

    • The use of microorganisms in sewage treatment

    • The development of genetic engineering

    Correct Answer
    A. The use of living organisms to make desired products
    Explanation
    Biotechnology refers to the use of living organisms to create useful products. This can involve various techniques such as genetic engineering, fermentation, and cell culture. By harnessing the capabilities of living organisms, biotechnology allows for the production of a wide range of products including medicines, vaccines, biofuels, and agricultural crops. It also plays a crucial role in improving the efficiency and sustainability of various industrial processes. Therefore, the best definition of biotechnology is the use of living organisms to make desired products.

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  • 39. 

    The idea of spontaneous generation postulated that:

    • Living organisms could arise from non-living material

    • Organisms could spontaneously evolve into more advance organisms

    • Organisms could evolve into next generation of organisms

    • Organisms could spontaneously arise from other living organisms

    Correct Answer
    A. Living organisms could arise from non-living material
    Explanation
    The idea of spontaneous generation postulated that living organisms could arise from non-living material. This theory was widely believed in ancient times, with people thinking that maggots could spontaneously generate from decaying meat or mice could be born from piles of dirty clothes. However, this idea was later disproven by experiments conducted by Louis Pasteur in the 19th century, which showed that living organisms only arise from preexisting living organisms through reproduction. This discovery led to the development of the theory of biogenesis, which states that life can only come from life.

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  • 40. 

    By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?

    • Simple diffusion

    • Extracellular enzymes

    • Facilitated diffusion

    • Active transport

    Correct Answer
    A. Active transport
    Explanation
    Active transport is the mechanism by which a cell can transport a substance from a lower to a higher concentration. Unlike passive transport mechanisms like simple diffusion and facilitated diffusion, active transport requires the cell to expend energy in the form of ATP to move molecules against their concentration gradient. This allows the cell to accumulate substances in higher concentrations than their surroundings, which is essential for various cellular processes such as nutrient uptake and ion regulation. Extracellular enzymes, on the other hand, are not involved in the transport of substances across the cell membrane.

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  • 41. 

    Bioremediation refers to:

    • Using microbe to study diseases

    • Using microbe in vaccine development

    • Using microbes to clean up pollution

    • Rehabilitating wayward bacteria

    Correct Answer
    A. Using microbes to clean up pollution
    Explanation
    Bioremediation refers to the use of microbes to clean up pollution. Microbes, such as bacteria and fungi, are used to break down and remove pollutants from contaminated soil, water, and air. These microbes have the ability to metabolize and degrade various pollutants, including oil spills, heavy metals, pesticides, and organic compounds. Bioremediation offers a cost-effective and environmentally friendly approach to remediate polluted environments, as it harnesses the natural abilities of microbes to degrade and detoxify harmful substances.

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  • 42. 

    S-S agar inhibits gram-positive bacteria. On this medium, bacteria that ferment lactose to produce red colonies, and bacteria that do not ferment lactose to produce colorless colonies. This medium is:

    • Both selective and differential

    • Differential

    • Enriched

    • Selective

    Correct Answer
    A. Both selective and differential
    Explanation
    S-S agar is both selective and differential. It is selective because it inhibits the growth of gram-positive bacteria, allowing only gram-negative bacteria to grow. It is differential because it allows for the differentiation of bacteria based on their ability to ferment lactose. Bacteria that ferment lactose produce red colonies, while bacteria that do not ferment lactose produce colorless colonies. Therefore, S-S agar serves as a selective medium by inhibiting certain bacteria and a differential medium by allowing for the differentiation of bacteria based on their lactose fermentation abilities.

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  • 43. 

    Which of the following chemical bonds is the strongest?

    • Ionic bond

    • Covalent bond

    • Hydrogen Bond

    • They all have the same strength

    Correct Answer
    A. Covalent bond
    Explanation
    Covalent bonds are the strongest type of chemical bonds. In a covalent bond, two atoms share electrons, creating a strong bond between them. This sharing of electrons results in a stable configuration for both atoms, making the bond difficult to break. Ionic bonds, on the other hand, involve the transfer of electrons from one atom to another, resulting in a weaker bond. Hydrogen bonds are even weaker than both ionic and covalent bonds, as they are formed between a hydrogen atom and an electronegative atom, such as oxygen or nitrogen. Therefore, the correct answer is covalent bond.

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  • 44. 

    Which of the following statements is true?

    • Endospores are for reproduction

    • A cell can produce many endospores

    • Endospores allow cell to survive environmental changes

    • A cell produces one endospore and keeps growing

    • Endospores are easily stained in Gram stain

    Correct Answer
    A. Endospores allow cell to survive environmental changes
    Explanation
    Endospores are specialized structures produced by certain bacteria in response to unfavorable environmental conditions. These structures are highly resistant to heat, radiation, chemicals, and desiccation. Endospores allow the bacterial cell to enter a dormant state, protecting its genetic material until conditions become favorable again. This enables the cell to survive harsh conditions such as extreme temperatures, lack of nutrients, or exposure to toxic substances. Therefore, the statement "endospores allow cell to survive environmental changes" is true.

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  • 45. 

    All of the following organisms are eukaryotes except:

    • Plants

    • Archaea

    • Protozoa

    • Fungi

    • All of these are eukaryotes

    Correct Answer
    A. Archaea
    Explanation
    Archaea are prokaryotes, not eukaryotes. Eukaryotes are organisms that have cells with a nucleus and other membrane-bound organelles, while prokaryotes lack a nucleus and organelles. Plants, protozoa, and fungi are all eukaryotes because they have cells with a nucleus and organelles. However, archaea are prokaryotes, meaning they do not have a nucleus or organelles. Therefore, the correct answer is archaea.

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  • 46. 

    Which of the following is not a kingdom in the five-kingdom system?

    • Protista

    • Algae

    • Plant

    • Animal

    • Monera

    Correct Answer
    A. Algae
    Explanation
    Algae is not a kingdom in the five-kingdom system. The five-kingdom system categorizes living organisms into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. Algae is a diverse group of photosynthetic organisms that can be found in various kingdoms, including Protista and Plantae, depending on their characteristics. However, it is not considered a separate kingdom in this classification system.

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  • 47. 

    This is not a major bioelement

    • Sulfur

    • Nitrogen

    • Hydrogen

    • Magnesium

    • Phosphate

    Correct Answer
    A. Magnesium
    Explanation
    Magnesium is not considered a major bioelement because it is not required in large quantities by living organisms. Major bioelements, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur, are essential for life and make up the majority of an organism's composition. While magnesium is still important for various biological processes, it is needed in smaller amounts compared to the major bioelements.

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  • 48. 

    Which of the following is not part of the cell membrane?

    • Fatty acids

    • Nucleic acids

    • Sugars

    • Amino acids

    Correct Answer
    A. Nucleic acids
    Explanation
    Nucleic acids are not part of the cell membrane. The cell membrane is primarily composed of lipids, such as fatty acids, which form a lipid bilayer. Sugars are also present in the form of glycolipids and glycoproteins, while amino acids are found in integral membrane proteins. However, nucleic acids, which include DNA and RNA, are not directly involved in the structure or function of the cell membrane. They are primarily responsible for storing and transmitting genetic information within the cell.

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  • 49. 

    Who disproved the theory of spontaneous generation?

    • Pasteur

    • Koch

    • Hooke

    • Van Leeuwenhoek

    Correct Answer
    A. Pasteur
    Explanation
    Pasteur disproved the theory of spontaneous generation. He conducted experiments in the mid-19th century where he showed that microorganisms do not arise spontaneously from non-living matter, but rather from pre-existing microorganisms. His experiments involved using swan-necked flasks to prevent dust particles and microorganisms from entering the flask, and he observed that no growth occurred in the broth within the flask, thus refuting the theory of spontaneous generation.

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  • Apr 23, 2025
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  • Jun 16, 2009
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    Jharry08

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