Brock Biology of Microorganisms Chapter 2 | Study Guide & Practice Questions

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1. An organism of the genus C) spherical/coiled
Staphylococcus is ________,
while an organism of the genus
Spirochaeta is ________.
A) spherical / rod shaped
B) rod shaped / coiled
C) spherical / coiled
D) coiled / spherical

2. Bacteria with type IV pili B) likely exhibit twitching motility.
A) possess tubular or stalk-like
extensions of their cells.
B) likely exhibit twitching
motility.
C) have capsules that promote
dehydration.
D) live in aquatic environ-
ments.

3. The terms "run" and "tumble" C) chemotaxis.
are generally associated with
A) eukaryotic cells.
B) nutrient transport.
C) chemotaxis.
D) clustering of certain
rod-shaped bacteria.

4. The morphology of a cell influ- D) motility and surface-to-volume ratio.
ences its
A) motility.
B) metabolism.
C) surface-to-volume ratio.
D) motility and surface-to-vol-
ume ratio.

5. Compared to Eukaryotes, Bac- D) higher/higher
teria and Archaea have
________ surface-to-volume
ratios, causing ________ nu-

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trient exchange and growth
rates.
A) lower / lower
B) lower / higher
C) higher / lower
D) higher / higher

6. The cytoplasmic membrane C) a highly selective permeability barrier.
could best be described as
A) an impermeable barrier.
B) a passive conduit for intra-
cellular transport.
C) a highly selective perme-
ability barrier.
D) a rigid structure that pro-
tects the cell.

7. Carrier-mediated transport is D) nutrient concentration is very low in the
necessary when environment, is higher inside of the cell, or
A) diffusion will not allow ade- diffusion is not possible.
quate amounts of a substance
to enter the cell.
B) movement into the cell is
against a concentration gradi-
ent.
C) the level of nutrients in na-
ture is very low.
D) nutrient concentration is
very low in the environment, is
higher inside of the cell, or dif-
fusion is not possible.

8. Nutrient transport requires en- A) ATP.
ergy because the nutrients
must be transported into the
cell against a concentration
gradient. The energy required
for nutrient transport is sup-
plied by


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A) ATP.
B) the proton motive force.
C) phosphoenol pyruvate.
D) ATP, the proton motive
force, or phosphoenol pyru-
vate.

9. Using phase contrast mi- B) swimming
croscopy on a wet mount of
live cells, you observe motile
bacilli moving rapidly and ran-
domly through the field of
view, changing directions after
a brief tumble and taking off
in a different direction. These
cells are exhibiting ________
motility.
A) twitching
B) swimming
C) gliding
D) twitching or gliding

10. Which of the following state- C) Flagellar rotation generates ATP.
ments is FALSE?
A) A flagellar protein subunit is
flagellin.
B) In flagellar motion, the basal
body acts as a motor.
C) Flagellar rotation generates
ATP.
D) The hook is the wider region
at the base of the flagellum.

11. Which of the following state- D) Fibriae are usually shorter than flagella
ments is TRUE? and enable cells to adhere to surfaces,
A) Fimbriae are generally whereas pili are involved in genetic ex-
shorter and more numerous change.
than flagella.
B) Fimbriae enable cells to


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