The Study Of Bacteria
Review of Bacteria in Biology 2.
Questions and Answers
- 1.
What are the most numerous organisms on Earth?
- A.
Earth worms
- B.
Bacteria
- C.
People
- D.
Dogs
Correct Answer
B. BacteriaExplanation
Bacteria are the most numerous organisms on Earth because they are tiny, single-celled organisms that can be found in almost every habitat on the planet. They can survive in extreme conditions and reproduce rapidly, allowing them to quickly colonize and dominate various environments. Additionally, bacteria have been around for billions of years, giving them ample time to diversify and spread across the globe. Their sheer numbers and adaptability make them the most abundant organisms on Earth.Rate this question:
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- 2.
What is the only food chain know that does not depend on the sun?
- A.
Deep Ocean Vents
- B.
Deep Ocean Trenches
- C.
Aquariums
- D.
The Rainforest
Correct Answer
A. Deep Ocean VentsExplanation
Deep Ocean Vents is the correct answer because unlike other food chains that rely on photosynthesis, Deep Ocean Vents are located in complete darkness and extreme pressure, where sunlight cannot reach. Instead, these ecosystems depend on chemosynthesis, a process where bacteria use chemicals from the vents to produce energy. This unique food chain is sustained by organisms that feed on these bacteria, forming a complex ecosystem that does not rely on the sun.Rate this question:
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- 3.
Deep Ocean Vents give off:
- A.
Sulfur, for chemosynthetic organisms
- B.
Light, for photosynthetic organisms
- C.
Light, for bioluminescent organisms
- D.
Radioactivity
Correct Answer
A. Sulfur, for chemosynthetic organismsExplanation
Deep ocean vents give off sulfur, which is used by chemosynthetic organisms as a source of energy for their metabolic processes. Chemosynthetic organisms are able to convert the sulfur compounds released from the vents into organic molecules, providing them with the necessary nutrients to survive in this extreme environment. This process is similar to photosynthesis, but instead of using sunlight as an energy source, chemosynthetic organisms utilize the chemical energy from sulfur compounds.Rate this question:
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- 4.
According to your notes, for what reason do we test bacteria?
- A.
To kill time
- B.
To get good grades
- C.
So we can kill them
- D.
To identify their species
Correct Answer
D. To identify their speciesExplanation
We test bacteria to identify their species. By conducting tests, we can determine the specific type of bacteria present, which is crucial for understanding its characteristics, behavior, and potential impact on human health or the environment. Identifying the species helps in developing appropriate treatment strategies, prevention measures, and further research.Rate this question:
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- 5.
The normal pH level of blood is
- A.
1.5 - 3.5
- B.
3.759 - 5. 254
- C.
7.35 - 7.45
- D.
10.9 - 10.7
Correct Answer
C. 7.35 - 7.45Explanation
The normal pH level of blood is 7.35 - 7.45. This range is considered normal because it indicates a slightly alkaline condition, which is necessary for the proper functioning of various physiological processes in the body. Maintaining this pH range is crucial for enzymes, proteins, and other molecules to function optimally. Any deviation from this range can lead to acidosis or alkalosis, which can disrupt normal bodily functions and potentially be life-threatening. Therefore, it is important to maintain the blood pH within this narrow range for overall health and well-being.Rate this question:
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- 6.
An Acid has extra:
- A.
H2O ions
- B.
OH- ions
- C.
OH+ ions
- D.
H- ions
- E.
H+ ions
Correct Answer
E. H+ ionsExplanation
An acid is a substance that donates protons (H+) when dissolved in water. Therefore, the correct answer is H+ ions, as acids release hydrogen ions into the solution.Rate this question:
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- 7.
A base has extra:
- A.
H+ ions
- B.
H2O ions
- C.
OH- ions
- D.
H- ions
- E.
H- ions
Correct Answer
C. OH- ionsExplanation
A base has extra OH- ions. In a solution, when a base dissolves, it releases OH- ions into the solution. These OH- ions are responsible for the basic properties of the solution, such as the ability to neutralize acids. Therefore, the presence of OH- ions indicates the presence of a base.Rate this question:
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- 8.
Control of pH is vital to organisms.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
pH is a measure of the acidity or alkalinity of a solution. Organisms have specific pH ranges in which they can function optimally. Deviations from this range can disrupt cellular processes and lead to detrimental effects. Therefore, maintaining control over pH levels is crucial for the survival and well-being of organisms.Rate this question:
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- 9.
A change in pH does not indicate a reaction.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A change in pH does indicate a reaction. pH is a measure of the acidity or alkalinity of a solution, and it can change as a result of a chemical reaction. When a reaction occurs, it can produce or consume hydrogen ions (H+) or hydroxide ions (OH-), which in turn affects the pH of the solution. Therefore, a change in pH can be an indication that a reaction has taken place.Rate this question:
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- 10.
Bacteria do not have have:
- A.
Cell Walls
- B.
Ribosomes
- C.
Cell Membranes
- D.
Membrane Bound Organelles
- E.
Non-Membrane Bound Organelles
Correct Answer
D. Membrane Bound OrganellesExplanation
Bacteria do not have membrane-bound organelles. Unlike eukaryotic cells, which have specialized compartments enclosed by membranes, bacteria lack these structures. Instead, their cellular functions occur within the cytoplasm, which is not divided into distinct organelles. Bacteria do have cell walls, ribosomes, cell membranes, and non-membrane bound organelles, but they do not possess membrane-bound organelles like mitochondria, Golgi apparatus, or endoplasmic reticulum.Rate this question:
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- 11.
What is an obligate Aerobe?
- A.
It requires Oxygen
- B.
It can not live in the presence of oxygen
- C.
It can live with or without oxygen
Correct Answer
A. It requires OxygenExplanation
An obligate aerobe is an organism that requires oxygen for its survival and growth. This means that it cannot live or carry out its metabolic processes in the absence of oxygen. These organisms have specific enzymes and metabolic pathways that are dependent on oxygen to produce energy. Without oxygen, they are unable to generate enough energy to sustain their life. Therefore, the correct answer is "It requires Oxygen."Rate this question:
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- 12.
A mesophile would most likely thrive:
- A.
On a computer keyboard
- B.
Near a deep ocean vent
- C.
In the Arctic Ocean
- D.
In the Sahara desert
Correct Answer
A. On a computer keyboardExplanation
A mesophile is an organism that thrives in moderate temperature ranges. A computer keyboard typically operates at room temperature, which falls within the mesophilic range. Therefore, a mesophile would most likely thrive on a computer keyboard.Rate this question:
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- 13.
Something that is sterile:
- A.
Is red
- B.
Is brown
- C.
Is new
- D.
Is free of bacteria and viruses
- E.
Is free of bacteria, viruses, and cells
Correct Answer
E. Is free of bacteria, viruses, and cellsExplanation
The correct answer is "is free of bacteria, viruses, and cells." Sterile refers to something that is completely free of any living organisms, including bacteria, viruses, and cells. This means that it is completely clean and devoid of any microorganisms that could cause contamination or infection.Rate this question:
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- 14.
Cocci are:
- A.
Rod shaped
- B.
Spherical
- C.
Corkscrew shaped
Correct Answer
B. SphericalExplanation
Cocci are spherical in shape. This means that they have a round or oval appearance when viewed under a microscope. Unlike rod-shaped bacteria (bacilli) or corkscrew-shaped bacteria (spirochetes), cocci have a distinct rounded shape. This shape is important in identifying and classifying different types of bacteria.Rate this question:
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- 15.
Diplococci are ________ that live in pairs.
- A.
Cocci
- B.
Bacillus
- C.
Spirochetes
Correct Answer
A. CocciExplanation
Diplococci are bacteria that live in pairs.Rate this question:
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- 16.
Which reagent must only be used for 15 seconds?
- A.
Crystal Violet
- B.
Iodine
- C.
Safranin
- D.
Alcohol
Correct Answer
D. AlcoholExplanation
Alcohol must only be used for 15 seconds because it is a decolorizing agent in the Gram staining process. After applying crystal violet and iodine, alcohol is used to wash away the excess stain from the Gram-negative bacteria. However, if alcohol is left on for too long, it can also remove the crystal violet stain from the Gram-positive bacteria, resulting in a false negative result. Therefore, it is crucial to limit the exposure of alcohol to 15 seconds to ensure accurate Gram staining results.Rate this question:
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- 17.
A 'strep' or 'strepto' bacteria is a bacteria that is/are:
- A.
In pairs
- B.
In chains
- C.
In clumps
- D.
By themselves
Correct Answer
B. In chainsExplanation
A 'strep' or 'strepto' bacteria is a bacteria that is found in chains. This means that the individual bacteria cells are connected to each other in a linear arrangement, forming a chain-like structure. This characteristic arrangement can be observed under a microscope and is used to classify certain types of bacteria.Rate this question:
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- 18.
A 'staph' or 'staphylo' bacteria is a bacteria that is/are
- A.
In pairs
- B.
In chains
- C.
In clumps
- D.
By themselves
Correct Answer
C. In clumpsExplanation
Staphylo bacteria are known to form clusters or clumps. This means that they tend to group together, forming a characteristic clumpy appearance. Unlike bacteria that form pairs or chains, staphylo bacteria prefer to exist in clumps. This clustering behavior is a distinguishing feature of staphylo bacteria and helps in their identification and classification.Rate this question:
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- 19.
The order for making a gram stain is:
- A.
Smear, use reagent, heat fix, cool, air dry
- B.
Smear, heat fix, cool, use reagent, air dry
- C.
Smear, air dry, heat fix, cool, use reagent
- D.
Heat fix, cool, use reagent, air dry, smear
Correct Answer
C. Smear, air dry, heat fix, cool, use reagentExplanation
The correct order for making a gram stain is to first create a smear of the sample. Then, allow the smear to air dry, which helps to fix the cells in place. After air drying, the smear is heat fixed by passing it through a flame, which kills the cells and adheres them to the slide. Once heat fixed, the slide is allowed to cool down. Finally, a reagent is applied to the smear, which helps to differentiate between gram-positive and gram-negative bacteria. Therefore, the correct order is smear, air dry, heat fix, cool, use reagent.Rate this question:
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- 20.
An example of a Gram Positive bacteria is a _____, and an example of a gram negative bacteria would be _____.
- A.
S. aureus, B. subtilis
- B.
S. aureus, E. coli
- C.
E. coli, P. mirabilis
Correct Answer
B. S. aureus, E. coliExplanation
Gram positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain used in the Gram staining technique. S. aureus is a well-known example of a Gram positive bacterium. On the other hand, Gram negative bacteria have a thin peptidoglycan layer and an outer membrane, which does not retain the stain, making them appear pink or red after the counterstain. E. coli is a commonly studied Gram negative bacterium. Therefore, the correct answer is S. aureus, E. coli.Rate this question:
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- 21.
Cells use _____ to ferment carbohydrates.
- A.
Acids
- B.
Ribosomes
- C.
Enzymes
- D.
Alcohol
Correct Answer
C. EnzymesExplanation
Cells use enzymes to ferment carbohydrates. Enzymes are biological catalysts that speed up chemical reactions in cells. In the process of fermentation, enzymes break down carbohydrates into simpler molecules, such as alcohol or acids, to produce energy. Therefore, enzymes are essential for the fermentation of carbohydrates in cells.Rate this question:
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- 22.
A/An _____ media will allow some bacteria to grow and slow the growth of other bacteria.
- A.
Enriched
- B.
Differential
- C.
Selective
- D.
Assay
Correct Answer
C. SelectiveExplanation
Selective media are designed to encourage the growth of certain types of bacteria while inhibiting the growth of others. This is achieved by incorporating specific ingredients or chemicals into the media that target and suppress the growth of unwanted bacteria. By selectively promoting the growth of desired bacteria, selective media can be used to isolate and identify specific bacterial species or strains. Therefore, a selective media will allow some bacteria to grow while slowing the growth of other bacteria.Rate this question:
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- 23.
Why is it important to keep the media covered?
- A.
To stop the media from drying out.
- B.
So agar doesn't leak out.
- C.
To prevent contamination.
- D.
To stop the smell of bacteria from getting out.
Correct Answer
C. To prevent contamination.Explanation
It is important to keep the media covered to prevent contamination. When the media is left uncovered, it is exposed to the environment which can lead to the introduction of unwanted microorganisms. These microorganisms can contaminate the media and interfere with the growth of the desired bacteria or other organisms. By keeping the media covered, the risk of contamination is reduced, ensuring that the growth conditions remain optimal and accurate results can be obtained.Rate this question:
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- 24.
Pathogens need _____ in the media to thrive.
- A.
HDL
- B.
LDL
- C.
SBA
- D.
TSI
Correct Answer
C. SBAExplanation
Pathogens need specific nutrients in the media to thrive. SBA, which stands for Sheep Blood Agar, is a type of culture medium that contains essential nutrients for the growth and survival of pathogens. This medium is commonly used in microbiology laboratories to support the growth of bacteria and identify their characteristics. Therefore, SBA provides the necessary components for pathogens to thrive and multiply.Rate this question:
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- 25.
Enzymes can be used to determine the species of a bacteria.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Enzymes can be used to determine the species of a bacteria because different species of bacteria produce different types and amounts of enzymes. By testing for the presence and activity of specific enzymes, it is possible to identify the species of bacteria present. This is commonly done in microbiology laboratories using techniques such as enzyme assays or molecular methods like polymerase chain reaction (PCR). Therefore, the statement "Enzymes can be used to determine the species of a bacteria" is true.Rate this question:
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Jan 18, 2023Quiz Edited by
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Oct 28, 2009Quiz Created by
Westernwishes
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