Chapter 15:
Viruses and Microorganisms
Practice Test
1.
Viral DNA may sometimes become integrated into a host bacterial cell's chromosome. What is the viral DNA called when this occurs?
a.
a lytic virus
b.
a retrovirus
c.
an endospore
d.
a provirus
Hint
2.
What are the very thin filaments that make up most true fungi?
a.
pseudopodia
b.
endospores
c.
hyphae
d.
plasmodium
Hint
3.
What role do most bacteria play in nature?
a.
producers
b.
consumers
c.
decomposers
d.
predators
Hint
4.
What is a relationship in which both organisms benefit?
a.
mutualism
b.
decomposition
c.
parasitism
d.
predation
Hint
5.
What is the cycle during which a virus takes over the total metabolic activities of the host cell, making many copies of itself?
a.
the carbon cycle
b.
the lytic cycle
c.
the lysogenic cycle
d.
the provirus cycle
Hint
6.
Where could you expect to find methane-producing bacteria?
a.
in the digestive tract of cattle
b.
in hot sulfur springs
c.
in salt lakes
d.
underwater near thermal vents
Hint
7.
What are organisms that live in or on other organisms?
a.
autotrophs
b.
saprophytes
c.
parasites
d.
hosts
Hint
8.
Which of these is NOT found in any monerans?
a.
outer capsules
b.
membrane-bound organelles
c.
cell walls
d.
flagella
Hint
9.
How do blue-green bacteria obtain energy?
a.
by photosynthesis
b.
through predation
c.
through parasitism
d.
by chemosynthesis
Hint
10.
A lichen consists of either a blue-green bacterium or a green alga and a(n) _________ .
a.
virus
b.
ciliate
c.
mold
d.
fungus
Hint
