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Chapter 27 Review
1 The DNA-containing region of this bacterial cell is indicated by the letter
A A.
B B.
C C.
D D.
E E.
2 The structure that regulates the passage of material into and
out of this bacterial cell is indicated by the letter
A A.
B B.
C C.
D D.
E E.
3 ______ are
A
B
C
D
surface appendages that allow a bacterium to stick to a surface.
Pili
Flagella
Cell walls
Ribosomes
4 What is the function of a bacterium's capsule?
A adhesion
B protection
C propulsion
D DNA containment
5 Where is a bacterial cell's DNA found?
A capsule
B nucleus
C ribosomes
D nucleoid region
6 In a bacterium, where are proteins synthesized?
A nucleus
B capsule
C ribosomes
D peroxisome
7 What name is given to the rigid structure, found outside the plasma membrane, that
surrounds and supports the bacterial cell?
A
B
C
D
E
pili
flagella
cell wall
peptidoglycan
nucleoid region
8 The prokaryotic cells that were the first to add significant quantities of oxygen to Earth's atmosphere are
classified as
A chlamydias.
B spirochetes.
C cyanobacteria.
D proteobacteria.
9 Spiral-shaped bacteria are likely to be placed with
A chlamydias.
B spirochetes.
C cyanobacteria.
D proteobacteria.
10 According to this cladogram, which of these pairs of prokaryotic subgroups share the most recent
common ancestor?
A
B
C
D
Euryarchaeota ... Cyanobacteria
Proteobacteria ... Crenarchaeota
Proteobacteria ... Euryarchaeota
Euryarchaeota ... Crenarchaeota
11 Photoautotrophs use
A CO2 as both an energy source and a carbon source.
B H2S as an energy source and CO2 as a carbon source.
C light as an energy source and CO2 as a carbon source.
D light as an energy source and methane as a carbon source.
12 Which of the following is the most common compound in the cell walls of gram-positive bacteria?
A lignin
B protein
C cellulose
D peptidoglycan
13 Which of the following is the correct order, from most external to most internal?
A cell wall, plasma membrane, capsule
B cell wall, capsule, plasma membrane
C capsule, plasma membrane, cell wall
D capsule, cell wall, plasma membrane
14 Which prokaryotes should be expected to be most strongly resistant to plasmolysis in hypertonic
environments?
A methanogens
B extreme halophiles
C extreme thermophiles
D nitrogen-fixing bacteria that live in root nodules
15 Which of the following statements about prokaryotes is TRUE?
A They divide by binary fission, without mitosis or meiosis.
B Their genetic material is confined within a nuclear envelope.
C The persistence of bacteria throughout evolutionary time is due to genetic similarity.
D Genetic variation in bacteria is not known to occur, nor should it occur, because of their
asexual mode of reproduction.