AnswersCO-Biology B-CRUnit Test

Bacteria Answers

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1
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Which could best be used to explain why bacteria can infect a person very quickly?

A
outer capsule
B
binary fission
C
protective covering
D
genetic recombination
2
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Which type of bacterial reproduction involves the donation of a single strand of plasmid DNA from one bacterial cell to another?

A
binary fission
B
conjugation
C
transformation
D
transduction
3

Which form of bacteria is matched correctly to its description?

A
spirillum—has a rod shape and exists in chains or alone
B
coccus—can cause MRSA and has a round shape
C
coccus—can cause acne and has a spiral shape
D
bacillus—has a spherical shape and can form clusters
4

What would happen to a bacterial cell if its protective covering was destroyed?

A
It would be better protected from the outside environment.
B
It would be able to take in materials more easily.
C
It would be harmed by chemicals in the environment.
D
It would reproduce more slowly.
5

Which mode of genetic recombination is matched correctly with its description?

A
transduction—virus transfers genes from one bacteria to another
B
conjugation—involves splitting of one cell and results in two identical cells
C
binary fission—requires direct cell-to-cell contact of bacteria
D
transformation—uses a pilus to transmit genetic information between bacteria
6

Which scientist devised tests that helped confirm that bacteria and other microorganisms cause a variety of diseases?

A
Robert Koch
B
Anton van Leeuwenhoek
C
Louis Pasteur
D
Alexander Fleming
7

How does Propionibacterium acnes cause acne in humans?

A
Overuse of antibiotics can cause bacteria to clog pores in humans.
B
This type of bacteria is found on the human skin, and it can clog pores.
C
This type of bacteria often enters a cut and causes an infection in humans.
D
Close contact with an infected person can lead to acne in humans.
8

Which series lists the correct order of steps of binary fission from first to last?

A
sex pilus connects two cells ® plasmid DNA is transferred ® complementary DNA strands are created ® cells separate
B
live cells bind to degraded cells ® DNA is transported across the membrane ® DNA is incorporated into recipient's DNA
C
virus infects bacterial cell, new viruses are made ® DNA is assembled in new virus ® new virus infects another bacterial cell and transfers DNA
D
DNA is copied ® DNA molecules attach to cell membrane ® cell membrane elongates and pinches off ® two identical cells are produced
9

Which bacterial form can be curved like a spiral, thick and rigid, or thin and flexible?

A
spirillum
B
coccus
C
bacillus
D
aerobic
10

What is the advantage of genetic recombination as a mode of reproduction in bacteria?

A
less time finding other bacteria
B
higher rates of reproduction
C
more susceptibility to antibiotics
D
greater genetic variation

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