Bio1a Exam- Chapter 3: Cell Theory And Structure
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Questions and Answers
- 1.
What did Leeuwenhoek do?
- A.
Looked at cork
- B.
Stated that animals are made of cells
- C.
All plants are made of cells
- D.
Used simple light microscope and saw microorganisms
Correct Answer
D. Used simple light microscope and saw microorganismsExplanation
Leeuwenhoek used a simple light microscope and observed microorganisms. This discovery was significant as it provided evidence for the existence of microscopic life forms, which was previously unknown. This observation contributed to the development of the field of microbiology and helped to establish the cell theory, which states that all living organisms are composed of cells.Rate this question:
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- 2.
T.Schwann did which of the following?
- A.
He said that plants are not made of cells
- B.
Said that animals aren't made of cells
- C.
Stated that all plants have cell
- D.
Stated that all animals have cells
Correct Answer
D. Stated that all animals have cellsExplanation
T. Schwann stated that all animals have cells. This is a significant contribution to the cell theory, which states that all living organisms are composed of cells. Schwann's statement helped to establish the understanding that cells are the basic building blocks of life and are present in all animals. This discovery was a crucial step towards our understanding of the structure and function of living organisms.Rate this question:
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- 3.
Robert Hooke was...?
- A.
The 1st to see a cell, and named it a cell(a room); looked at cork; saw a line of cells that reminded him of rooms.
- B.
Said that al plants are multicellular
- C.
Said that the begining unit is always a cell
- D.
Was the 2nd person to see a man on earth
Correct Answer
A. The 1st to see a cell, and named it a cell(a room); looked at cork; saw a line of cells that reminded him of rooms.Explanation
Robert Hooke was the first person to see a cell and named it a cell because when he looked at cork, he saw a line of cells that reminded him of rooms.Rate this question:
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- 4.
What does the Cell Theory state?
- A.
That all living things are made of cells
- B.
Every cell has only one nucleus
- C.
That plants cannot have cells
- D.
Animals are only one that have cells
Correct Answer
A. That all living things are made of cellsExplanation
The Cell Theory states that all living things are made of cells. This theory, proposed by Matthias Schleiden and Theodor Schwann in the 19th century, revolutionized the understanding of biology. It states that cells are the basic unit of life and that all organisms are composed of one or more cells. This theory also states that cells arise from pre-existing cells through cell division. It does not mention anything about the number of nuclei in a cell or whether plants or animals have cells.Rate this question:
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- 5.
True or False? Cell is the basic unit of life...
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The cell is considered the basic unit of life because it is the smallest structural and functional unit of an organism. Cells carry out all the necessary functions for life, such as metabolism, reproduction, and responding to stimuli. They are also capable of self-replication and have the ability to differentiate into specialized cell types. Therefore, it can be concluded that the cell is indeed the fundamental building block of all living organisms.Rate this question:
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- 6.
True or False? The beginning unit is always a cell. it starts from cells to tissues to organs to organ system to organisms.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true. The beginning unit in the hierarchy of biological organization is always a cell. Cells are the basic building blocks of life and they come together to form tissues, which then form organs, organ systems, and ultimately organisms. This hierarchical organization is a fundamental principle in biology.Rate this question:
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- 7.
True or False? All cells don't come from pre-existing cells.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
All cells come from pre-existing cells because of the principle of biogenesis, which states that living organisms can only arise from pre-existing living organisms. This principle was demonstrated by Louis Pasteur in his experiments disproving spontaneous generation. Therefore, it is false to say that all cells don't come from pre-existing cells.Rate this question:
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- 8.
1. What does the term resolution refer to?
- A.
How big an image can be
- B.
How sharp an image can be
- C.
How many lenses a microscope uses
- D.
How much light is needed to see an image
Correct Answer
B. How sharp an image can beExplanation
The term resolution refers to how sharp an image can be. Resolution is a measure of the level of detail that can be seen in an image. It determines the clarity and sharpness of the image by indicating the number of pixels or dots per inch that can be displayed or captured. A higher resolution means more pixels or dots per inch, resulting in a sharper and more detailed image.Rate this question:
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- 9.
Which organelle is the control center of the cell?
- A.
Chloroplast
- B.
Mitochondrian
- C.
Nucleus
- D.
Ribosome
Correct Answer
C. NucleusExplanation
The nucleus is the control center of the cell because it contains the cell's DNA, which carries the instructions for the cell's functions and characteristics. It also regulates gene expression and controls the synthesis of proteins. The nucleus is surrounded by a double membrane, called the nuclear envelope, which helps protect the DNA and regulate the movement of molecules in and out of the nucleus.Rate this question:
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- 10.
Which term refers to the movement of materials through a cell membrane by using the cell's energy?
- A.
Osmosis
- B.
Engulfing
- C.
Passive transport
- D.
Active transport
Correct Answer
D. Active transportExplanation
Active transport refers to the movement of materials through a cell membrane by using the cell's energy. This process requires the cell to expend energy in order to transport molecules or ions across the membrane against their concentration gradient. Unlike passive transport, which does not require energy, active transport allows the cell to control the movement of specific substances and maintain internal conditions necessary for its survival.Rate this question:
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- 11.
Which organelles release chemicals that break down large food particles into smaller ones?
- A.
Lysosomes
- B.
Golgi bodies
- C.
Chloroplasts
- D.
Vacuoles
Correct Answer
A. LysosomesExplanation
Lysosomes release chemicals that break down large food particles into smaller ones. Lysosomes contain digestive enzymes that help in the breakdown of macromolecules such as proteins, carbohydrates, and lipids. These enzymes are capable of breaking down large food particles into smaller molecules that can be easily absorbed and utilized by the cell. Therefore, lysosomes play a crucial role in intracellular digestion and recycling of cellular components.Rate this question:
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- 12.
What is the function of the cell wall?
- A.
To prevent oxygen from entering the cell
- B.
To prevent water from entering the cell
- C.
To perform different functions in each cell
- D.
To protect and support the cell
Correct Answer
D. To protect and support the cellExplanation
The cell wall is responsible for protecting and supporting the cell. It acts as a rigid structure that surrounds the cell membrane, providing structural support and preventing the cell from bursting under osmotic pressure. Additionally, the cell wall helps to protect the cell from mechanical damage and pathogens.Rate this question:
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- 13.
Which of the following best describes the function of mitochondria?
- A.
They convert energy from food molecules into energy the cell can use.
- B.
They store energy from food molecules.
- C.
They store energy from sunlight
- D.
They produce nucleic acids that release energy
Correct Answer
A. They convert energy from food molecules into energy the cell can use.Explanation
Mitochondria are known as the powerhouse of the cell because they are responsible for converting energy from food molecules into a form that the cell can use, which is adenosine triphosphate (ATP). This process is called cellular respiration and occurs in the mitochondria's inner membrane. Through a series of chemical reactions, mitochondria break down glucose and other molecules to release energy in the form of ATP, which is used for various cellular processes. Therefore, the correct answer is that mitochondria convert energy from food molecules into energy the cell can use.Rate this question:
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- 14.
Which term refers to the movement of molecules from an area of high concentration to an area of lower concentration?
- A.
Osmosis
- B.
Diffusion
- C.
Concentration
- D.
Active transport
Correct Answer
B. DiffusionExplanation
Diffusion refers to the movement of molecules from an area of high concentration to an area of lower concentration. This process occurs due to the random motion of molecules and does not require any energy input. Osmosis, on the other hand, specifically refers to the movement of water molecules across a semi-permeable membrane. Concentration is a measure of the amount of solute present in a given volume of solvent. Active transport, unlike diffusion, involves the movement of molecules against their concentration gradient and requires energy expenditure.Rate this question:
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- 15.
The nucleus of a cell has thin strands of________________________ that contain genetic material
Correct Answer
chromatinExplanation
The nucleus of a cell contains thin strands of chromatin, which is a complex of DNA, RNA, and proteins. Chromatin is responsible for packaging and organizing the genetic material within the nucleus. It plays a crucial role in regulating gene expression and ensuring the proper functioning of the cell.Rate this question:
- 16.
Small grainlike bodies called____________________produce proteins inside cells
Correct Answer
ribosomesExplanation
Ribosomes are small grainlike bodies that are responsible for producing proteins inside cells. They are found in both prokaryotic and eukaryotic cells and are composed of RNA and proteins. Ribosomes play a crucial role in protein synthesis by reading the genetic information from messenger RNA (mRNA) and using it to assemble amino acids into a polypeptide chain. These proteins are essential for various cellular functions and are involved in processes such as cell growth, repair, and regulation. Therefore, ribosomes are vital organelles in cells that contribute to the production of proteins necessary for the organism's survival and functioning.Rate this question:
- 17.
A________________is a group of similar cells that work together to perform a specific function.
Correct Answer
tissueExplanation
A tissue is a group of similar cells that work together to perform a specific function. Tissues can be found in various parts of the body and are essential for the proper functioning of organs and systems. They can be categorized into four main types: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. Each type of tissue has its own unique structure and function, allowing them to contribute to the overall functioning and maintenance of the body.Rate this question:
- 18.
Unlike passive transport, active transport requires the cell to use ___________________.
Correct Answer
energyExplanation
Active transport is a process in which a cell uses energy to move molecules or ions across the cell membrane against their concentration gradient. This energy is required because active transport involves the movement of molecules from an area of lower concentration to an area of higher concentration, which is opposite to the direction of natural diffusion. Therefore, the statement "active transport requires the cell to use energy" is a correct explanation for why active transport is different from passive transport.Rate this question:
- 19.
Two structures that are found only in plant cells are________________and__________.
Correct Answer
chloroplasts cell wallExplanation
Chloroplasts are only found in plant cells and are responsible for photosynthesis, converting sunlight into energy. They contain chlorophyll, which gives plants their green color. The cell wall is another structure unique to plant cells. It provides support and protection to the cell, maintaining its shape and preventing it from bursting under pressure. Unlike animal cells, plant cells have a rigid cell wall made of cellulose.Rate this question:
- 20.
Oxygen molecules move across cell membranes through a process called____________.
Correct Answer
diffusionExplanation
Oxygen molecules move across cell membranes through a process called diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. In this case, oxygen molecules move from an area of higher concentration outside the cell to an area of lower concentration inside the cell, allowing for the exchange of oxygen between the cell and its surroundings.Rate this question:
- 21.
The diffusion of _____________________molecules through a selectively permeable membrane is called osmosis.
Correct Answer
waterExplanation
Osmosis is the process by which water molecules move from an area of lower solute concentration to an area of higher solute concentration through a selectively permeable membrane. In this case, the correct answer is "water" because it is the most common molecule that undergoes osmosis.Rate this question:
- 22.
Organelles known as_______________________ contain chemicals that break down food particles and old cell parts.
Correct Answer
lysosomesExplanation
Lysosomes are organelles within cells that contain enzymes capable of breaking down food particles and old cell parts through a process called hydrolysis. These enzymes are responsible for the digestion and recycling of cellular waste materials. Lysosomes play a crucial role in maintaining cell health and are often referred to as the "cleanup crew" of the cell.Rate this question:
- 23.
Two forms of passive transport are____________________and __________________.
Correct Answer
diffusion osmosisExplanation
Passive transport refers to the movement of molecules across a cell membrane without the use of energy. Diffusion is the process in which molecules move from an area of higher concentration to an area of lower concentration. Osmosis, on the other hand, is the diffusion of water molecules across a selectively permeable membrane. Both diffusion and osmosis are examples of passive transport because they occur spontaneously and do not require any energy input from the cell.Rate this question:
- 24.
Unlike passive transport, active transport requires the cell to use ___________________.
Correct Answer
energyExplanation
Active transport is a cellular process that requires the cell to expend energy in order to move molecules or ions against their concentration gradient. This energy is used to transport substances across the cell membrane, allowing the cell to maintain internal homeostasis and perform vital functions. Unlike passive transport, which relies on the natural movement of molecules from an area of high concentration to low concentration, active transport actively pumps molecules against this gradient, requiring the input of energy.Rate this question:
- 25.
Two structures that are found only in plant cells are________________and__________.
Correct Answer
chloroplasts cell wallExplanation
Chloroplasts are organelles found only in plant cells and are responsible for photosynthesis, the process by which plants convert sunlight into energy. The cell wall is another unique feature of plant cells, providing structural support and protection. These two structures, chloroplasts and cell wall, are exclusive to plant cells and are not found in animal cells.Rate this question:
- 26.
Oxygen molecules move across cell membranes through a process called____________.
Correct Answer
diffusionExplanation
Oxygen molecules move across cell membranes through a process called diffusion. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In this case, oxygen molecules move from an area of higher concentration outside the cell to an area of lower concentration inside the cell, allowing for the exchange of oxygen between the cell and its surroundings.Rate this question:
- 27.
The diffusion of _____________________molecules through a selectively permeable membrane is called osmosis.
Correct Answer
waterExplanation
Osmosis is the process by which water molecules move from an area of higher concentration to an area of lower concentration through a selectively permeable membrane. In this case, the correct answer is "water" because osmosis specifically refers to the diffusion of water molecules.Rate this question:
- 28.
Organelles known as_______________________ contain chemicals that break down food particles and old cell parts.
Correct Answer
lysosomesExplanation
Lysosomes are organelles that contain enzymes capable of breaking down food particles and old cell parts through a process called hydrolysis. These enzymes are responsible for the digestion and recycling of cellular waste materials. Lysosomes play a crucial role in maintaining cellular homeostasis and are essential for the overall health and functioning of the cell.Rate this question:
- 29.
A light microscope that has two or more lenses is called (a oran)____________________.
Correct Answer
light compoundExplanation
A light microscope that has two or more lenses is called a light compound microscope. This type of microscope uses multiple lenses to magnify the specimen, allowing for greater magnification and resolution. The combination of lenses in the compound microscope helps to reduce aberrations and improve the clarity of the image. This makes it a commonly used microscope in scientific research, education, and other fields where detailed examination of small objects is required.Rate this question:
- 30.
The organelle that is referred to as the "control center" of the cell is the
- A.
Nucleus
- B.
Nucleolus
- C.
Mitochondrion
Correct Answer
A. NucleusExplanation
The nucleus is referred to as the "control center" of the cell because it contains the cell's genetic material, DNA. It regulates the cell's activities by controlling the expression of genes and directing the synthesis of proteins. The nucleus also plays a crucial role in cell division, as it coordinates the replication and distribution of DNA during mitosis. Additionally, the nucleus is responsible for the production of ribosomes, which are essential for protein synthesis. Therefore, the nucleus is considered the control center of the cell as it governs many vital cellular processes.Rate this question:
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- 31.
The endoplasmic reticulum is sometimes referred to as a(n)
- A.
Powerhouse of the cell
- B.
Intracellular highway
- C.
Packaging and processing center of the cell
Correct Answer
B. Intracellular highwayExplanation
The endoplasmic reticulum is sometimes referred to as an intracellular highway because it is responsible for the transportation of proteins and lipids within the cell. It consists of a network of interconnected tubules and vesicles that extend throughout the cytoplasm, allowing for the movement of molecules from one part of the cell to another. This transportation function is essential for the proper functioning of the cell and enables the distribution of newly synthesized proteins and lipids to their respective destinations within the cell. Therefore, the term "intracellular highway" accurately describes the role of the endoplasmic reticulum in facilitating cellular transport.Rate this question:
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- 32.
These vesicles that are produced in the Golgi apparatus contain digestive enzymes that rid the cell of dead or worn out parts
- A.
Peroxisomes
- B.
Lysosomes
- C.
Chromosomes
Correct Answer
B. LysosomesExplanation
Lysosomes are organelles produced in the Golgi apparatus that contain digestive enzymes. These enzymes help break down and recycle cellular waste, such as dead or worn-out parts. Lysosomes play a crucial role in maintaining cellular health and removing unwanted materials from the cell.Rate this question:
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- 33.
These small, somewhat spherical organelles are produced in the nucleolus and carry out the process of protein synthesis
- A.
Ribosomes
- B.
Vesicles
- C.
Chromosomes
Correct Answer
A. RibosomesExplanation
Ribosomes are small organelles that are responsible for protein synthesis. They are produced in the nucleolus, a region within the nucleus of the cell. Ribosomes play a crucial role in translating the genetic information encoded in the DNA into functional proteins. They do this by reading the messenger RNA (mRNA) and assembling amino acids into a polypeptide chain. This process occurs on the surface of the ribosomes, where they act as a platform for protein synthesis. Therefore, ribosomes are the correct answer for this question.Rate this question:
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- 34.
Proteins and other materials produced in the endoplasmic reticulum are packaged into specific bundles, placed in vesicles, and sent out of the cell by the
- A.
Nucleus
- B.
Nucleolus
- C.
Golgi apparatus
Correct Answer
C. Golgi apparatusExplanation
The Golgi apparatus is responsible for packaging proteins and other materials produced in the endoplasmic reticulum into specific bundles and placing them in vesicles. These vesicles are then sent out of the cell to their intended destinations. The nucleus and nucleolus are not involved in this process.Rate this question:
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- 35.
Microtubules and microfilaments are found throughout the cytoplasm for all the following purposes except
- A.
Transporting substances across the plasma membrane
- B.
Serve as "tracks" for organelle movement inside the cell
- C.
Provide structure and support for the cell
Correct Answer
A. Transporting substances across the plasma membraneExplanation
Microtubules and microfilaments are not involved in transporting substances across the plasma membrane. They primarily serve as "tracks" for organelle movement inside the cell and provide structure and support for the cell. Other cellular components such as proteins and vesicles are responsible for transporting substances across the plasma membrane.Rate this question:
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- 36.
The jellylike fluid which fills the space inside the cell is called the
- A.
Nucleoplasm
- B.
Cytosol
- C.
Lysosol
Correct Answer
B. CytosolExplanation
The correct answer is cytosol. Cytosol is the jelly-like fluid that fills the space inside the cell, surrounding the organelles. It is a complex mixture of water, ions, small molecules, and proteins. It plays a crucial role in various cellular processes such as metabolism, protein synthesis, and signaling. Nucleoplasm, on the other hand, refers specifically to the fluid present inside the nucleus, while lysosol is not a recognized term.Rate this question:
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- 37.
Having many ribosomes attached to it, this organelle produces proteins as well as other substances and then transports them to other parts of the cell
- A.
Rough ER
- B.
Smooth ER
- C.
Nucleolus
Correct Answer
A. Rough ERExplanation
The correct answer is rough ER because it is known for having many ribosomes attached to its surface. These ribosomes are responsible for protein synthesis. The rough ER also plays a crucial role in the production and transport of other substances within the cell.Rate this question:
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- 38.
Lacking bound ribosomes, this structure produces different types of lipids to be transported to other parts of the cell
- A.
Rough ER
- B.
Smooth ER
- C.
Nucleolus
Correct Answer
B. Smooth ERExplanation
The smooth ER is the correct answer because it lacks bound ribosomes and is responsible for producing different types of lipids that are then transported to other parts of the cell. The absence of ribosomes on its surface distinguishes it from the rough ER, which is involved in protein synthesis. The nucleolus, on the other hand, is responsible for the production of ribosomes and is not directly involved in lipid synthesis or transport.Rate this question:
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- 39.
Composed of a phospholipid bilayer with integral and peripheral proteins, this cell structure is semi-permeable, allowing only certain substances to pass into or out of the cell
- A.
Nuclear envelope
- B.
Mitochondrial cristae
- C.
Plasma membrane
Correct Answer
C. Plasma membraneExplanation
The plasma membrane is composed of a phospholipid bilayer with integral and peripheral proteins. This structure is semi-permeable, meaning it allows only certain substances to pass into or out of the cell. It acts as a barrier, regulating the movement of molecules and ions in and out of the cell, maintaining homeostasis.Rate this question:
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- 40.
In eukaryotic cells, DNA is found here
- A.
Cytosol
- B.
Plasma membrane
- C.
Nucleus
Correct Answer
C. NucleusExplanation
In eukaryotic cells, DNA is found in the nucleus. The nucleus is a membrane-bound organelle that contains the cell's genetic material, including DNA. It serves as the control center of the cell, regulating gene expression and directing cellular activities. The DNA in the nucleus is organized into chromosomes and is responsible for storing and transmitting genetic information. The other options, cytosol and plasma membrane, do not contain DNA in eukaryotic cells.Rate this question:
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- 41.
In prokaryotic cells, genetic material is located here
- A.
Nucleus
- B.
Nucleolus
- C.
Nucleoid
Correct Answer
C. NucleoidExplanation
The correct answer is nucleoid. In prokaryotic cells, genetic material is not enclosed within a nucleus like in eukaryotic cells. Instead, it is found in a region called the nucleoid. The nucleoid is a region within the cytoplasm where the DNA molecule is located. It is not surrounded by a membrane or any other protective structure, but it is still organized and compacted to fit within the prokaryotic cell. The nucleoid plays a crucial role in the storage and expression of genetic information in prokaryotes.Rate this question:
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- 42.
This structure, not found in animal cells, provides strength for plant cells and is found outside the plasma membrane
- A.
Central vacuole
- B.
Plastid
- C.
Cell wall
Correct Answer
C. Cell wallExplanation
The cell wall is a structure that is unique to plant cells and is not found in animal cells. It provides strength and support to the plant cell, helping it maintain its shape and structure. The cell wall is located outside the plasma membrane and acts as a protective barrier. It is composed of cellulose and other complex carbohydrates, giving it its strength and rigidity.Rate this question:
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- 43.
Characteristics of a compound microscope
- A.
Two lenses inside the microscope (eye or ocular lens)
- B.
Two lenses inside the microscope (ocular or viewing)
- C.
One lense in the microscope (ocular)
- D.
Two lenses inside the microscope (eye lense or ocular lense) and objective lense
Correct Answer
D. Two lenses inside the microscope (eye lense or ocular lense) and objective lenseExplanation
The correct answer is two lenses inside the microscope (eye lens or ocular lens) and objective lens. A compound microscope consists of two lenses - the eyepiece or ocular lens, which is located at the top of the microscope and is used to view the specimen, and the objective lens, which is located near the specimen and is responsible for magnifying the image. These two lenses work together to provide a higher magnification and resolution compared to a single lens microscope.Rate this question:
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- 44.
How does a light microscope work?
- A.
Uses light to view a thin object or slice of object to see details
- B.
Uses light to view cork cells
- C.
Uses an electron beam to produce radiation which enlarges the cells to 5 million times the original size
- D.
Uses Ultraviolet waves to produce a visual image of a living thing
Correct Answer
A. Uses light to view a thin object or slice of object to see detailsExplanation
A light microscope works by using light to illuminate a thin object or a slice of an object. The light passes through the object and is focused by lenses, which magnify the image and allow for the observation of fine details. This type of microscope is commonly used in biology and medicine to study cells, tissues, and small organisms.Rate this question:
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- 45.
As magnification increases, more details can be seen.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
As magnification increases, the image appears larger and more zoomed in. This allows for a closer view of the object being observed, revealing more details that may not be visible at lower magnifications. Therefore, the statement that more details can be seen as magnification increases is true.Rate this question:
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- 46.
Limits of the resolution of magnification are
- A.
Fuzzy viewing
- B.
The microscope ceases to function
- C.
The coarse lense becomes stuck.
- D.
Both A and C
Correct Answer
A. Fuzzy viewingExplanation
The correct answer is "Fuzzy viewing." This is because when the limits of the resolution of magnification are reached, the image viewed through the microscope becomes unclear and fuzzy. This can happen when the magnification is increased beyond the capabilities of the microscope or when the lenses are not properly adjusted. It does not necessarily mean that the microscope ceases to function or that the coarse lens becomes stuck.Rate this question:
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- 47.
The cell is the most basic unit of life
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The cell is indeed the most basic unit of life. Cells are the smallest structural and functional units of living organisms, and they are responsible for carrying out all the necessary processes for life to exist. Cells can vary in size, shape, and function, but they all have certain characteristics in common, such as a cell membrane, genetic material, and the ability to reproduce. Without cells, life as we know it would not be possible, making the statement "The cell is the most basic unit of life" true.Rate this question:
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- 48.
Cells are only in mammals
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. Cells are not only found in mammals, but in all living organisms. Cells are the basic structural and functional units of life, and they are present in plants, animals, fungi, protists, and bacteria.Rate this question:
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- 49.
Prokaryotic cells dont have nucleus's
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Prokaryotic cells do not have a nucleus because they lack a membrane-bound nucleus that houses their genetic material. Instead, their DNA is located in the cytoplasm, which is not separated from the rest of the cell by a nuclear membrane. This characteristic is one of the key differences between prokaryotic and eukaryotic cells, where eukaryotic cells have a distinct nucleus that contains their DNA. Therefore, the statement "Prokaryotic cells don't have nuclei" is true.Rate this question:
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- 50.
Who first discovered the cell
- A.
Aaron Kettler
- B.
Robert Hooke
- C.
Theodore Schwann
- D.
Rudolf Virchow
Correct Answer
B. Robert HookeExplanation
Robert Hooke is credited with being the first person to discover cells. In 1665, he observed thin slices of cork under a microscope and noticed small, box-like structures that he called "cells" due to their resemblance to the cells of a monastery. This discovery revolutionized the understanding of the microscopic world and laid the foundation for the field of cell biology. Hooke's observations and descriptions of cells paved the way for further discoveries and advancements in the study of living organisms.Rate this question:
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