Science 8: Test On Cells
Instructions:
You are given 35 minutes to answer this answer this test.
The correct answers will not be revealed after you answer each question.
You are given 2 attempts to improve your score, if you still have extra time.
Important:
Answer the test quietly. If you cheat or make unnecessary noise, your monitor will be shut off for 30 seconds as penalty.
Questions and Answers
- 1.
What life process is shown by binary fission in bacteria?
- A.
Growth
- B.
Movement
- C.
Reproduction
- D.
Nutrition
Correct Answer
C. ReproductionExplanation
Binary fission in bacteria is a form of asexual reproduction where a single organism divides into two identical daughter cells. This process allows bacteria to rapidly increase their population and is a key mechanism for their survival and proliferation. Therefore, the correct answer is reproduction.Rate this question:
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- 2.
Which of the following shows a correct order from smallest to biggest?
- A.
Cells --> tissues --> organ --> organ system
- B.
Cells --> organelles --> tissues --> organ
- C.
Organelles --> organ --> tissue --> cells
- D.
Cells --> organelles --> organ --> organ system
Correct Answer
A. Cells --> tissues --> organ --> organ system -
- 3.
Which of the following is NOT an organ?
- A.
Heart
- B.
Nucleus
- C.
Intestine
- D.
Kidney
Correct Answer
B. NucleusExplanation
The nucleus is not an organ because it is a cellular structure found within cells, specifically in eukaryotic cells. It is responsible for storing the genetic material and controlling the cell's activities. While organs are larger structures made up of different tissues that perform specific functions in the body, the nucleus is a smaller component within cells.Rate this question:
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- 4.
Which of the statements below is TRUE about yeasts?
- A.
Yeasts are multicellular and eukaryotic
- B.
Yeasts are multicellular and prokaryotic
- C.
Yeasts are unicellular and eukaryotic
- D.
Yeasts are unicellular and prokaryotic
Correct Answer
C. Yeasts are unicellular and eukaryoticExplanation
Yeasts are unicellular and eukaryotic organisms. This means that they are composed of a single cell and their cells have a nucleus and other membrane-bound organelles. Yeasts are a type of fungus and are commonly used in baking and brewing. They reproduce asexually through budding, where a small daughter cell grows off the parent cell. Yeasts play important roles in various industries and also have significance in scientific research, particularly in the study of genetics and cell biology.Rate this question:
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- 5.
All of the following are made up of 1 or more cells, EXCEPT:
- A.
Bacteria
- B.
Virus
- C.
Fungi
- D.
Animals
- E.
Plants
Correct Answer
B. VirusExplanation
All of the options listed, bacteria, fungi, animals, and plants, are made up of one or more cells. However, viruses are not considered living organisms and do not have cells. They are instead composed of genetic material (DNA or RNA) surrounded by a protein coat. Therefore, the correct answer is virus.Rate this question:
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- 6.
Duplication of DNA takes place during ________________
- A.
Interphase
- B.
Metaphase
- C.
Cytokinesis
- D.
Anaphase
Correct Answer
A. InterphaseExplanation
DNA replication occurs during the interphase of the cell cycle. Interphase is the phase between cell divisions where the cell grows and prepares for division. During interphase, the DNA is duplicated so that each daughter cell will receive a complete set of genetic information. Metaphase, anaphase, and cytokinesis are all stages of mitosis, where the duplicated DNA is separated and distributed to the daughter cells. Therefore, the correct answer is interphase.Rate this question:
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- 7.
Which part of the microscope allows you to shift objectives?
- A.
Ocular
- B.
Revolving nosepiece
- C.
Diaphragm
- D.
Coarse adjustment knob
Correct Answer
B. Revolving nosepieceExplanation
The revolving nosepiece of a microscope allows you to shift objectives. This part holds the different objective lenses and can be rotated to switch between them. By rotating the nosepiece, you can easily change the magnification power of the microscope and focus on different details of the specimen being observed. This feature is essential for adjusting the microscope to obtain clear and detailed images at different magnifications.Rate this question:
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- 8.
Under which objective will you see a larger diameter or field of view (in um)?
- A.
LPO (4x)
- B.
MPO (10x)
- C.
HPO (40x)
- D.
Ocular (10x)
Correct Answer
A. LPO (4x)Explanation
The objective with the larger diameter or field of view will provide a wider view of the specimen. In this case, the LPO (4x) objective has a lower magnification compared to the MPO (10x) and HPO (40x) objectives. Generally, objectives with lower magnification have a larger diameter or field of view, allowing for a broader view of the specimen. The ocular (10x) refers to the eyepiece and does not affect the diameter or field of view of the objective.Rate this question:
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- 9.
What is the difference between mitosis and cytokinesis?
- A.
Cytokinesis is the division of the cytoplasm, while mitosis is the division of the nucleus.
- B.
Cytokinesis is the division of the nucleus, while mitosis is the division of the cytoplasm.
- C.
Cytokinesis happens in plants, while mitosis happens in animals.
- D.
Cytokinesis happens in animals, while mitosis happens in plants.
Correct Answer
A. Cytokinesis is the division of the cytoplasm, while mitosis is the division of the nucleus.Explanation
Cytokinesis and mitosis are both processes involved in cell division. Cytokinesis specifically refers to the division of the cytoplasm, which occurs after the nucleus has divided. During cytokinesis, the cytoplasm is divided into two daughter cells. On the other hand, mitosis is the process of dividing the nucleus, where the DNA is replicated and distributed equally into two daughter nuclei. Therefore, the correct answer is that cytokinesis is the division of the cytoplasm, while mitosis is the division of the nucleus.Rate this question:
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- 10.
What is the basic difference between prokaryotic and eukaryotic cells?
- A.
A eukaryotic cell has a nucleus, while a prokaryotic cell has no nucleus.
- B.
A prokaryotic cell has a nucleus, while a eukaryotic cell has no nucleus.
- C.
All prokaryotic organisms are unicellular, while all eukaryotic organisms are multicellular.
- D.
All prokaryotic organisms are multicellular, while all eukaryotic organisms are unicellular.
Correct Answer
A. A eukaryotic cell has a nucleus, while a prokaryotic cell has no nucleus.Explanation
The basic difference between prokaryotic and eukaryotic cells is that eukaryotic cells have a nucleus, while prokaryotic cells do not. The presence of a nucleus in eukaryotic cells allows for the compartmentalization of DNA and other cellular components, which enables more complex cellular functions. Prokaryotic cells, on the other hand, lack a nucleus and have their DNA freely floating in the cytoplasm. This structural difference is one of the key distinctions between these two types of cells.Rate this question:
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- 11.
Which of the following shows the correct order in the cell cycle?
- A.
Interphase ïƒ anaphase ïƒ metaphase ïƒ telophase ïƒ prophase ïƒ cytokinesis
- B.
Interphase ïƒ prophase ïƒ telophase ïƒ anaphase ïƒ metaphase ïƒ cytokinesis
- C.
Interphase ïƒ prophase ïƒ metaphase ïƒ anaphase ïƒ telophase ïƒ cytokinesis
- D.
Interphase ïƒ metaphase ïƒ anaphase ïƒ prophase ïƒ telophase ïƒ cytokinesis
Correct Answer
C. Interphase ïƒ prophase ïƒ metaphase ïƒ anaphase ïƒ telophase ïƒ cytokinesisExplanation
The correct order in the cell cycle is interphase, prophase, metaphase, anaphase, telophase, and cytokinesis. Interphase is the longest phase where the cell grows and DNA is replicated. Prophase is the first stage of mitosis where the chromosomes condense and the nuclear envelope breaks down. Metaphase is the stage where the chromosomes line up in the middle of the cell. Anaphase is when the sister chromatids separate and move towards opposite ends of the cell. Telophase is the stage where the nuclear envelope reforms and the chromosomes decondense. Finally, cytokinesis is the division of the cytoplasm to form two daughter cells.Rate this question:
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- 12.
Study the table below. Legend: / - present x - absent Which of the 4 cells is most likely taken from a human cheek?
- A.
Cell A
- B.
Cell B
- C.
Cell C
- D.
Cell D
Correct Answer
B. Cell BExplanation
Cell B is most likely taken from a human cheek because it contains a "x" in the column for "absent" in both the "chloroplast" and "cell wall" rows. This indicates that it is a eukaryotic cell, which is characteristic of human cheek cells. The presence of a "x" in the "nucleus" row also supports this, as the nucleus is a defining feature of eukaryotic cells.Rate this question:
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- 13.
Study the table below. Legend: / - present x - absent Which of the 4 cells is most likely a leaf cell?
- A.
Cell A
- B.
Cell B
- C.
Cell C
- D.
Cell D
Correct Answer
A. Cell AExplanation
Cell A is most likely a leaf cell because it is the only cell in the table that has a "/" symbol, indicating that it is present. The other cells have an "x" symbol, indicating that they are absent.Rate this question:
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- 14.
Study the diagram below. Which 2 chromosomes form a homologous pair?
- A.
A and B
- B.
C and D
- C.
A and C
- D.
B and C
Correct Answer
C. A and CExplanation
Homologous chromosomes are pairs of chromosomes that have the same genes in the same order, although the alleles may be different. In the given diagram, chromosomes A and C are shown to have similar patterns and lengths, indicating that they are homologous chromosomes. Therefore, A and C form a homologous pair.Rate this question:
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- 15.
What happens during anaphase?
- A.
Splitting of sister chromatids
- B.
Alignment of chromosomes at the equator
- C.
Moving of sister chromatids towards opposite poles
- D.
Coiling and condensing of DNA
Correct Answer
A. Splitting of sister chromatidsExplanation
During anaphase, the sister chromatids, which are replicated copies of each chromosome, separate and move towards opposite poles of the cell. This splitting of sister chromatids ensures that each daughter cell receives a complete set of chromosomes during cell division. The movement of sister chromatids towards opposite poles is facilitated by the contraction of spindle fibers, which pull the chromatids apart. This process ensures the accurate distribution of genetic material and is a crucial step in cell division.Rate this question:
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- 16.
Which microscope part functions for controlling the amount of light?
- A.
Light source
- B.
Diaphragm
- C.
Revolving nosepiece
- D.
The stage
Correct Answer
B. DiaphragmExplanation
The diaphragm is a microscope part that functions for controlling the amount of light. It is located below the stage and can be adjusted to regulate the intensity of light passing through the specimen. By opening or closing the diaphragm, the user can increase or decrease the amount of light that reaches the specimen, allowing for optimal visibility and clarity during observation.Rate this question:
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- 17.
What are homologous chromosomes?
- A.
A pair of chromosomes with the same gene sequence and structure.
- B.
A pair of sister chromatids joined at the centromere.
- C.
Duplicated DNA
- D.
A pair of sister chromatids that separate during anaphase.
Correct Answer
A. A pair of chromosomes with the same gene sequence and structure.Explanation
Homologous chromosomes are a pair of chromosomes that have the same gene sequence and structure. This means that they contain the same genes in the same order, although they may have different alleles. Homologous chromosomes are inherited from each parent and are involved in genetic recombination during meiosis. They align and exchange genetic material during a process called crossing over, which contributes to genetic diversity. Therefore, the correct answer is that homologous chromosomes are a pair of chromosomes with the same gene sequence and structure.Rate this question:
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- 18.
What is joined by a centromere?
- A.
Homologous chromosomes
- B.
Sister chromatids
- C.
Daughter cells
- D.
Duplicated DNA
Correct Answer
B. Sister chromatidsExplanation
Sister chromatids are joined by a centromere. During the cell division process, the DNA in a chromosome is replicated, resulting in two identical copies called sister chromatids. These sister chromatids are held together at the centromere until they separate during cell division. Therefore, sister chromatids are the correct answer for what is joined by a centromere.Rate this question:
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- 19.
Which of the following shows anaphase?
- A.
![Science 8: Test On Cells - Quiz]()
- B.
![Science 8: Test On Cells - Quiz]()
- C.
![Science 8: Test On Cells - Quiz]()
- D.
![Science 8: Test On Cells - Quiz]()
- E.
![Science 8: Test On Cells - Quiz]()
- F.
![Science 8: Test On Cells - Quiz]()
Correct Answer
C.Explanation
Anaphase is the stage of mitosis or meiosis in which the sister chromatids or homologous chromosomes separate and move towards opposite poles of the cell. This process is crucial for the equal distribution of genetic material to the daughter cells. In anaphase, the microtubules of the spindle apparatus shorten, pulling the chromosomes apart and elongating the cell. The correct answer to the question would be a visual representation or description of this process, showing the separation and movement of chromosomes towards opposite poles.Rate this question:
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- 20.
What are the 4 phases of mitosis in the cell cycle? Choose 4.
- A.
Anaphase
- B.
Prophase
- C.
Metaphase
- D.
Telophase
- E.
Interphase
- F.
Cytokinesis
Correct Answer(s)
A. Anaphase
B. Prophase
C. Metaphase
D. TelophaseExplanation
The correct answer is anaphase, prophase, metaphase, and telophase. These are the four phases of mitosis in the cell cycle. During prophase, the chromosomes condense and the nuclear envelope breaks down. In metaphase, the chromosomes line up at the center of the cell. Anaphase is characterized by the separation of sister chromatids, which are pulled to opposite ends of the cell. Finally, in telophase, the nuclear envelope reforms and the chromosomes decondense.Rate this question:
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- 21.
Which of the following are the 3 main ideas of the cell theory? Choose 3
- A.
The cell is the basic unit of structure and function in living things.
- B.
All living things are made up of 1 or more cells.
- C.
Cells come from previously existing cells.
- D.
The nucleus is the control center of the cell.
- E.
Viruses are not cells.
Correct Answer(s)
A. The cell is the basic unit of structure and function in living things.
B. All living things are made up of 1 or more cells.
C. Cells come from previously existing cells.Explanation
The cell theory consists of three main ideas. First, the cell is the basic unit of structure and function in living things. This means that all living organisms are composed of cells and that cells perform all the necessary functions for life. Second, all living things are made up of one or more cells. This implies that cells are the building blocks of life and are responsible for the structure and organization of organisms. Third, cells come from previously existing cells. This principle states that cells can only arise from pre-existing cells through cell division. These three ideas form the foundation of the cell theory and are crucial in understanding the structure and function of living organisms.Rate this question:
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- 22.
Which of the following can be found in all kinds of cells? Choose 4.
- A.
Cell wall
- B.
Cell membrane
- C.
Cytoplasm
- D.
Nucleus
- E.
DNA
- F.
Mitochondria
- G.
Ribosomes
Correct Answer(s)
B. Cell membrane
C. Cytoplasm
E. DNA
G. RibosomesExplanation
The cell membrane is a universal feature of all cells, as it serves as a protective barrier and regulates the movement of substances in and out of the cell. Cytoplasm is also found in all cells and is the gel-like substance that fills the cell and contains various organelles. DNA, the genetic material, is present in all cells and carries the instructions for cell function. Ribosomes are essential for protein synthesis and can be found in all cells. Therefore, these four options - cell membrane, cytoplasm, DNA, and ribosomes - can be found in all kinds of cells.Rate this question:
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- 23.
What are common to both plant and animal cells, but are not found in bacterial cells? Choose 2.
- A.
Cell wall
- B.
Cell membrane
- C.
Nucleus
- D.
Cytoplasm
- E.
Chloroplast
- F.
Ribosomes
- G.
Mitochondria
Correct Answer(s)
C. Nucleus
G. MitochondriaExplanation
Plant and animal cells both have a nucleus, which is a membrane-bound organelle that contains the cell's DNA. Bacterial cells, on the other hand, do not have a true nucleus. Additionally, both plant and animal cells have mitochondria, which are responsible for generating energy in the form of ATP. Bacterial cells do not have mitochondria.Rate this question:
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- 24.
What happens when a cell gets bigger? Choose 2.
- A.
Surface area increases faster than the volume.
- B.
Volume increases faster than the surface area.
- C.
The SA:V increases.
- D.
The SA:V ratio decreases.
Correct Answer(s)
B. Volume increases faster than the surface area.
D. The SA:V ratio decreases.Explanation
When a cell gets bigger, the volume increases faster than the surface area. This is because volume is calculated by cubing the length, while surface area is calculated by squaring the length. As a result, the increase in volume is more significant compared to the increase in surface area. Additionally, as the cell grows, the SA:V ratio decreases. This is because the surface area increases at a slower rate than the volume, causing the ratio of surface area to volume to decrease.Rate this question:
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- 25.
Which of the following are reasons for cell division in multicellular eukaryotic organisms? Choose 3.
- A.
Asexual reproduction
- B.
Growth
- C.
Replacement of worn-out cells
- D.
Small SA:V
- E.
Large SA:V
Correct Answer(s)
B. Growth
C. Replacement of worn-out cells
E. Large SA:VExplanation
Cell division is necessary for growth in multicellular eukaryotic organisms because it allows for the production of more cells, which leads to an increase in overall size. Additionally, cell division is important for the replacement of worn-out cells, as old cells can be replaced with new ones through the process of cell division. Lastly, having a large surface area to volume ratio (SA:V) is advantageous for efficient nutrient exchange and waste removal, and cell division can help maintain a large SA:V ratio by producing more cells.Rate this question:
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- 26.
Which 2 pointed parts of the microscope give you the total magnification when viewing a specimen? Choose 2.
- A.
A
- B.
B
- C.
C
- D.
D
- E.
E
- F.
F
- G.
G
Correct Answer(s)
C. C
E. EExplanation
The correct answer is C and E. In a microscope, the total magnification is determined by the combination of the magnification of the objective lens (part C) and the eyepiece lens (part E). The objective lens is located at the lower end of the microscope and provides the initial magnification of the specimen. The eyepiece lens is located at the upper end of the microscope and further magnifies the image produced by the objective lens. Therefore, the combination of these two lenses determines the total magnification when viewing a specimen.Rate this question:
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- 27.
Name the pointed part of the microscope.
Correct Answer(s)
diaphragm
diaphram
diapragm
diaframExplanation
The correct answer is "diaphragm". The diaphragm is a part of the microscope that controls the amount of light passing through the specimen. It is located beneath the stage and can be adjusted to increase or decrease the intensity of light, allowing for better visibility and clarity of the specimen being observed.Rate this question:
- 28.
Which arrow points to the organelle that functions as the power center of the cell? (Write the letter of the arrow.)
Correct Answer(s)
F
f
F.
f.Explanation
The correct answer is F. The arrow pointing to the organelle labeled F is the one that represents the power center of the cell. This organelle is the mitochondria, which is responsible for generating energy in the form of ATP through cellular respiration. It plays a crucial role in the metabolism and overall functioning of the cell.Rate this question:
- 29.
Name 1 organelle in the diagram that you cannot find in an animal cell.
Correct Answer(s)
cell wall
Cell Wall
Cell wall
cellwall
chloroplast
Chloroplast
chloroplasts
ChloroplastsExplanation
The correct answer is cell wall. The cell wall is a rigid structure found in plant cells, fungi, and some bacteria, but it is not present in animal cells. It provides support and protection to the cell, helping to maintain its shape and prevent it from bursting under pressure. Animal cells do not have a cell wall, instead they have a flexible cell membrane that allows for movement and interaction with their environment.Rate this question:
- 30.
What cell organelle can you see which will help you identify the cell as eukaryotic or prokaryotic?
Correct Answer(s)
nucleus
Nucleus
nuclues
NucluesExplanation
The presence or absence of a nucleus is a key characteristic that can help identify a cell as either eukaryotic or prokaryotic. Eukaryotic cells have a distinct nucleus, which contains the cell's genetic material, while prokaryotic cells lack a nucleus and have their genetic material dispersed throughout the cytoplasm. Therefore, if a cell has a nucleus, it is likely eukaryotic, and if it lacks a nucleus, it is likely prokaryotic.Rate this question:
- 31.
Name the phase of the cell cycle shown by the diagram.
Correct Answer(s)
Anaphase
anaphaseExplanation
The diagram shows a phase of the cell cycle where the sister chromatids of each chromosome separate and move towards opposite ends of the cell. This phase is called anaphase. During anaphase, the microtubules of the spindle apparatus contract, pulling the sister chromatids apart and towards the poles of the cell. The correct answer is anaphase because it accurately describes the phase depicted in the diagram.Rate this question:
- 32.
Name the phase of the cell cycle that happens BEFORE the phase shown by the diagram.
Correct Answer(s)
prophase
Prophase
Interphase
interphaseExplanation
The phase of the cell cycle that happens before prophase is interphase. Interphase is the longest phase of the cell cycle where the cell grows, carries out its normal functions, and replicates its DNA in preparation for cell division. Prophase is the first phase of mitosis where the chromatin condenses into chromosomes, the nuclear envelope breaks down, and the spindle fibers start to form.Rate this question:
- 33.
If the HPO (40x) diameter is 400 um, what is the MPO (10x) diameter?
Correct Answer(s)
1600
1,600
1,600 um
1600 um
1, 600
1, 600 umExplanation
The MPO (10x) diameter is equal to the HPO (40x) diameter multiplied by the magnification factor, which is 4 in this case. Therefore, the MPO diameter is 400 um multiplied by 4, which equals 1600 um.Rate this question:
- 34.
If the total magnification of a microscope is 336x and the objective magnification is 42x, what is the magnification of the ocular?
Correct Answer(s)
8
8x
8X
8 x
8 XExplanation
The magnification of a microscope is calculated by multiplying the objective magnification with the magnification of the ocular. In this case, the objective magnification is given as 42x and the total magnification is given as 336x. Therefore, the magnification of the ocular can be found by dividing the total magnification by the objective magnification: 336x / 42x = 8. So, the magnification of the ocular is 8.Rate this question:
- 35.
If 50 cells fit across the LPO(4x) diameter, how many cells will fit across the HPO (40x) diameter?
Correct Answer(s)
5
5 cells
5cells
5 Cells
5CellsExplanation
The LPO (4x) diameter is 10 times smaller than the HPO (40x) diameter. Since the number of cells that fit across the LPO diameter is 50, we can assume that the same number of cells will fit across the HPO diameter. Therefore, the answer is 5 cells.Rate this question:
- 36.
If the HPO diameter is 800 um, what is the length (in um) of the cell shown below?
Correct Answer(s)
200
200 um
200um
200 Um
200Um - 37.
What is the surface area-to-volume ratio of the cell model shown below? Set your ratio to _____:1
Correct Answer(s)
3.66:1
3.666:1
3.67:1
3.667:1Explanation
The surface area-to-volume ratio of a cell model is a measure of the amount of surface area compared to the volume. It is important because it affects the cell's ability to exchange materials with its environment. A higher surface area-to-volume ratio allows for more efficient exchange of nutrients and waste products. In this case, all four ratios provided (3.66:1, 3.666:1, 3.67:1, 3.667:1) are very close to each other, suggesting that the cell model has a relatively high surface area compared to its volume.Rate this question:
- 38.
What is the MPO (10x) diameter (in um) shown in the diagram below?
Correct Answer(s)
1,600 um
1,600
1600um
1,600 - 39.
Which of the following is TRUE about genes, DNA and chromosomes?
- A.
Genes are sections of DNA which coils and condenses into chromosomes.
- B.
DNA are sections of genes which coil and condense into chromosomes.
- C.
Genes are sections of chromosomes which coil and condense into DNA.
- D.
Chromosomes are sections of DNA which coils and condenses into genes.
Correct Answer
A. Genes are sections of DNA which coils and condenses into chromosomes.Explanation
Genes are sections of DNA that contain the instructions for building proteins and other molecules in the body. DNA is the molecule that carries the genetic information in the form of a double helix structure. Chromosomes are structures made up of DNA and proteins that store and organize the genetic material in the nucleus of a cell. Therefore, the correct answer is that genes are sections of DNA which coils and condenses into chromosomes.Rate this question:
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- 40.
Which cell has the largest size?
- A.
Bacteria
- B.
Animal cell
- C.
Plant cell
- D.
Virus
Correct Answer
C. Plant cellExplanation
The plant cell has the largest size compared to the other options listed. Plant cells are typically larger than bacteria and animal cells because they have additional structures such as a cell wall, central vacuole, and chloroplasts. These structures contribute to the overall size of the plant cell, making it larger than the other options. Viruses, on the other hand, are much smaller than cells and cannot be considered as a contender for the largest size.Rate this question:
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.jpg "Study the table below.
Legend: / - present x - absent
Which of the 4 cells is most likely a leaf cell?")
.jpg)
.jpg "Name the phase of the cell cycle that happens BEFORE the phase shown by the diagram.")
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