AnswersCA-Life Science B High SchoolPopulation Growth

Bacteria Answers

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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
2
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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
3

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.
4

Consider this microscopic image of bacteria.Based on its shape, what is most likely the form of this bacteria?

Question illustration
A
coccus
B
staphus
C
bacillus
D
spirillum
5

Which type of bacteria can be found in pairs, chains, squares of four, cubes of eight, or grapelike clusters?

A
coccus
B
bacillus
C
spirillum
D
pili
6

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.
7

Which correctly describes a process that occurs in bacteria?

A
In binary fission, the two new cells that are formed are susceptible to the same antibiotic.
B
In conjugation, bacterial DNA is transferred from one bacterium to another by a replicating virus.
C
In transduction, the cells that are formed are susceptible to the same antibiotic.
D
In transformation, a special sex pilus is required to connect two bacterial cells.
8

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

A
spirillum
B
coccus
C
bacillus
D
aerobic
9

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
10

Fast reproduction by binary fission enables bacteria to

A
cause infections in other organisms.
B
quickly modify their DNA to changing conditions.
C
change shape from coccus to bacillus.
D
transfer DNA from one cell to another.

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