Pretest Answers

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

A
genetic recombination
B
binary fission
C
outer capsule
D
protective covering
3

Which form of bacteria is matched correctly to its description?

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

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
virus infects bacterial cell, new viruses are made → DNA is assembled in new virus → new virus infects another bacterial cell and transfers DNA
C
DNA is copied → DNA molecules attach to cell membrane → cell membrane elongates and pinches off → two identical cells are produced
D
live cells bind to degraded cells → DNA is transported across the membrane → DNA is incorporated into recipient's DNA
5

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

A
greater genetic variation
B
less time finding other bacteria
C
more susceptibility to antibiotics
D
higher rates of reproduction
7

Fast reproduction by binary fission enables bacteria to

A
quickly modify their DNA to changing conditions.
B
change shape from coccus to bacillus.
C
transfer DNA from one cell to another.
D
cause infections in other organisms.
8

Which correctly describes a process that occurs in bacteria?

A
In transduction, the 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 binary fission, the two new cells that are formed are susceptible to the same antibiotic.
D
In transformation, a special sex pilus is required to connect two bacterial cells.
9

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

A
transformation—uses a pilus to transmit genetic information between bacteria
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
transduction—virus transfers genes from one bacteria to another

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