BIO 250 Microbiology quizzes units 1-4

Questions from Quiz Assignments 1-4 (3 of these sets are all quiz 1)

Question 1
All of the following are reasons why some scientists believe that the term “prokaryote”
is a somewhat artificial designation and should be discarded except
Select one:
a. Some bacteria have internal membranous structures.
b. Some bacteria have their genetic material enclosed within a membrane.
c. Some bacteria have 80S ribosomes.


d. Many bacterial have cytoskeletal elements.
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The correct answer is: Some bacteria have 80S ribosomes.

Question 2
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How do spheroplasts and protosplasts differ?
Select one:
a. Spheroplasts retain the peptidoglycan but protoplasts do not.


b. Spheroplasts retain their outer membrane but protoplasts do not.
c. There is no difference; these terms are synonyms.
d. Spheroplasts form from cocci and protoplasts form from bacilli.
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The correct answer is: Spheroplasts retain their outer membrane but protoplasts do not.

Question 3
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Which of the following is a characteristic of active transport?
Select one:
a. Saturable uptake rate
b. Use of ATP or a proton gradient as a source of metabolic energy
c. Can move materials against a concentration gradient
d. All of the choices are correct.


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The correct answer is: All of the choices are correct.

Question 4

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You have been studying the effect of a concentration gradient on the rate of transport of
a nutrient into a bacterial cell. If a carrier protein is involved in the transport of this
nutrient, which curve would you expect to see?




Select one:
a. A


b. B
c. C

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The correct answer is: A

Question 5
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Which statement correctly describes archaeal cell walls?
Select one:
a. Some have an outer layer of complex polysaccharide.
b. Some have an outer layer of protein.
c. Many have peptidoglycan.
d. Some have an outer layer of complex polysaccharide and some have an outer layer of
protein.


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The correct answer is: Some have an outer layer of complex polysaccharide and some
have an outer layer of protein.

Question 6
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The food vacuoles and phagocytic vacuoles are most similar to
Select one:
a. mitochondria.
b. chloroplasts.
c. lysosomes.


d. Golgi apparatus.
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The correct answer is: lysosomes.

Question 7
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A newly discovered unicellular microbe has a nucleus containing linear chromosomes
and surrounded by a membrane. It has mitochondria, 80s ribosomes, and is covered by
cilia. There is no cell wall external to the plasma membrane. This organism most likely
would be a/an
Select one:

, a. bacterium.
b. archaeon.
c. protozoan.


d. fungus.
e. algae.
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The correct answer is: protozoan.

Question 8
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Which of the following is a function of the mitochondrion?
Select one:
a. Tricarboxylic acid cycle enzyme reactions
b. Electron transport
c. ATP synthesis
d. All of the choices are correct.


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The correct answer is: All of the choices are correct.

Question 9
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Virion size ranges from
Select one:
a. 1–40 nm.
b. 10–400 nm.


c. 600–1,000 nm.
d. 1,000–10,000 nm.
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The correct answer is: 10–400 nm.

Question 10
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