AnswersHVA 26-27 IM Biology ALab: Diffusion Across a Semi-permeable Membrane

Bacteria Answers

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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.
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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
3

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
4

Which scientist developed the idea that microorganisms can cause diseases?

A
Paul Ehrlich
B
Anton van Leeuwenhoek
C
Louis Pasteur
D
Alexander Fleming
5

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.
6

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
7

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
8

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
9

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
10

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

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