Chapter 19 - Viruses, Bacteria, and Archaeans

Question 1

A(n) ___________ May have a genome of RNA or DNA.

a. bacterium
b. viroid
c. virus
d. archaean

Answer 1

c. virus

Question 2

Which is smallest?

a. bacterium
b. viroid
c. virus
d. archaean

Answer 2

b. viroid

Question 3

In _____________, viral DNA is integrated into a bacterial chromosome and passed to descendant cells.

a. prokaryotic fission
b. the lytic pathway
c. the lysogenic pathway
d. both b and c

Answer 3

c. the lysogenic pathway

Question 4

The genetic material of HIV is _____________.

Answer 4

RNA

Question 5

Viral genomes can be altered by _____________.

a. mutation
b. gene exchanges
c. both a and b

Answer 5

c. both a and b

Question 6

True or false? Prokaryotic conjugation is a type of asexual reproduction.

Answer 6

False

Question 7

How many chromosomes does an archaean have?

Answer 7

one

Question 8

All _________ are oxygen-releasing photoautotrophs.

a. spirochete
b. archaeans
c. cyanobacteria
d. bacteria

Answer 8

c. cyanobacteria

Question 9

Nitrogen-fixing bacteria produce ____________.

a. methane
b. ammonia
c. nitrogen gas

Answer 9

b. ammonia

Question 10

Vitamin-producing E. coli cells in your gut are _______________.

a. normal flora
b. chemoheterotrophs
c. bacteria
d. all of the above

Answer 10

d. all of the above

Question 11

Some soil bacteria such as Bacillus anthracis survive harsh conditions by forming a(n) _______.

a. endospore
b. heterocyst
c. plasmid

Answer 11

a. endospore

Question 12

A Gram-positive coccus is __________.

a. spherical
b. rod-shaped
c. spiral-shaped

Answer 12

a. spherical

Question 13

The vector for Lyme disease is a(n) ____________.

a. spirochete
b. archaean
c. tick

Answer 13

c. tick

Question 14

Production of __________ by archaeans May contribute to global warming.

a. methane
b. nitrogen
c. oxygen

Answer 14

a. methane

Question 15

Match the terms with their most suitable description.

\_\_\_ archaean 
\_\_\_ cynobacteria
\_\_\_ virus 
\_\_\_ viroid 
\_\_\_ plasmid 
\_\_\_ extreme halophile 
\_\_\_ nucleoid 
\_\_\_ extreme thermophile 

a. plant-infecting RNA
b. noncellular infectious particle; nucleic acid core, protein coat
c. liked it hot
d. site of bacterial chromosome
e. sister group to the eukaryotes
f. evolved into chloroplasts
g. small circle of bacterial DNA
h. salt lover

Answer 15

Match the terms with their most suitable description.

(e) archaean
(f) cynobacteria
(b) virus
(a) viroid
(g) plasmid
(h) extreme halophile
(d) nucleoid
(c) extreme thermophile

a. plant-infecting RNA
b. noncellular infectious particle; nucleic acid core, protein coat
c. liked it hot
d. site of bacterial chromosome
e. sister group to the eukaryotes
f. evolved into chloroplasts
g. small circle of bacterial DNA
h. salt lover