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Campbell Biology Ch. 6 - 7 Test Bank Questions & 100% Correct AnswersLatest Test | Graded A+ | Passed

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Campbell Biology

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Campbell Biology

1) When biologists wish to study the internal ultrastructure of cells, they can achieve the finest resolution by using A) a phase-contrast light microscope. B) a scanning electron microscope. C) a transmission electronic microscope. D) a confocal fluorescence microscope. E) a super-resolutio...

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campbell biology ch 6 7 test bank questions 1

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Campbell Biology Ch. 6 - 7 Test Bank
Questions & 100% Correct Answers-
Latest Test | Graded A+ | Passed
1) When biologists wish to study the internal ultrastructure of cells, they can achieve the

finest resolution by using

A) a phase-contrast light microscope.

B) a scanning electron microscope.

C) a transmission electronic microscope.

D) a confocal fluorescence microscope.

E) a super-resolution fluorescence microscope.

֎ -:- C

2) The advantage of light microscopy over electron microscopy is that

A) light microscopy provides for higher magnification than electron microscopy.

B) light microscopy provides for higher resolving power than electron microscopy.

C) light microscopy allows one to view dynamic processes in living cells.

D) light microscopy provides higher contrast than electron microscopy.

E) specimen preparation for light microcopy does not produce artifacts.

֎ -:- c

26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |2

3) A primary objective of cell fractionation is to

A) view the structure of cell membranes.

B) sort cells based on their size and weight.

C) determine the size of various organelles.

D) separate the major organelles so that their particular functions can be determined.

E) separate lipid-soluble from water-soluble molecules.

֎ -:- Answer: D

4) In the fractionation of homogenized cells using centrifugation, the primary factor that

determines whether a specific cellular component ends up in the supernatant or the pellet

is

A) the relative solubility of the component.

B) the size and weight of the component.

C) the percentage of carbohydrates in the component.

D) the presence or absence of nucleic acids in the component.

E) the presence or absence of lipids in the component.

֎ -:- B

26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |3

5) Which of the following correctly lists the order in which cellular components will be found

in the pellet when homogenized cells are treated with increasingly rapid spins in a

centrifuge?

A) ribosomes, nucleus, mitochondria

B) chloroplasts, ribosomes, vacuoles

C) nucleus, ribosomes, chloroplasts

D) vacuoles, ribosomes, nucleus

E) nucleus, mitochondria, ribosomes

֎ -:- E

6) Green fluorescent protein (GFP) can be used to fluorescently label a specific protein in

cells by genetically engineering cells to synthesize the target protein fused to GFP. What is

the advantage of using GFP fusions to visualize specific proteins, instead of staining cells

with fluorescently labeled probes that bind to the target protein?

A) GFP fusions enable one to track changes in the location of the protein in living cells;

staining usually requires preserved cells.

B) GFP fusions enable higher resolution than staining with fluorescent probes.

C) GFP permits the position of the protein in the cell more precisely than fluorescent

probes.

D) GFP permits visualization of protein-protein interactions; fluorescent probes do not.

26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |4

E) GFP fusions are not subject to artifacts; fluorescent probes may introduce background

artifacts.

֎ -:- A

7) What is the reason that a modern electron microscope (TEM) can resolve biological

images to the subnanometer level, as opposed to tens of nanometers achievable for the

best super-resolution light microscope?

A) The focal length of the electron microscope is significantly longer.

B) Contrast is enhanced by staining with atoms of heavy metal.

C) Electron beams have much shorter wavelengths than visible light.

D) The electron microscope has a much greater ratio of image size to real size.

E) The electron microscope cannot image whole cells at one time.

֎ -:- C

8) What technique would be most appropriate to use to observe the movements of

condensed chromosomes during cell division?

A) light microscopy

B) scanning electron microscopy

C) transmission electron microscopy

D) confocal fluorescence microscopy

26/08/2024 | © Copyright- This work may not be copied for profit.

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Campbell Biology Ch. 6 - 7 Test Bank Questions & 100% Correct AnswersLatest Test | Graded A+ | Passed

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