Chapter 19

A(n) ___may have a genome of RNA or DNA. a. bacterium b. viroid c. virus d. archaean

Which is smallest? a. bacterium b. viroid c. virus d. archaean

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

The genetic material of HIV is ___.

Viral genomes can be altered by ___. a. mutation b. gene exchanges c. both a and \(b\)

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

All ____ are oxygen-releasing photoautotrophs. a. spirochetes b. archaeans c. cyanobacteria d. bacteria

Nitrogen-fixing bacteria produce ___. a. methane b. ammonia c. nitrogen gas

Vitamin-producing \(E\), coli cells in your gut are __. a. normal flora b. chemoheterotrophs c. bacteria d. all of the above

Some soil bacteria such as Bacillus anthracis survive harsh conditions by forming a(n) ___. a. endospore b. heterocyst c. plasmid

A Gram-positive coccus is ___. a. spherical b. rod-shaped c. spiral-shaped

The vector for Lyme disease is a(n) ___. a. spirochete b. archaean c. tick

Production of _____ by archaeans may contribute to global warming. a. methane b. nitrogen c. oxygen

Match the terms with their most suitable description. $$ \text { archaean } \quad \quad\quad\quad\quad \text { a. plant-infecting RNA } $$ $$ \text { cyanobacteria } \quad \quad\quad\quad\quad \text { b. noncellular infectious particle; nucleic acid core, protein coat } $$ $$ \text { virus } \quad \quad\quad\quad\quad \text { c. likes it hot } $$ $$ \text { viroid} \quad \quad\quad\quad\quad \text { d. site of bacterial chromosome } $$ $$ \text { plasmid } \quad \quad\quad\quad\quad \text { e. sister group to the eukaryotes } $$ $$ \text { extreme halophile } \quad \quad\quad\quad\quad \text { f. evolved into chloroplasts } $$ $$ \text { nucleoid } \quad \quad\quad\quad\quad \text { g. small circle of bacterial DNA } $$ $$ \text { extreme thermophile } \quad \quad\quad\quad\quad \text { h. salt lover } $$