Chapter 19

Only \(\quad\) are prokaryotic. a. archaeans b. bacteria c. prions d. both a and b

Bacteria transfer plasmids by ___ a. prokaryotic fission b. endospore formation c. conjugation d. the lytic pathway

\(\mathrm{All} \quad\) are oxygen-releasing photoautotrophs. a. spirochetes b. chlamydias c. cyanobacteria d. proteobacteria

Normally harmless \(E .\) coli cells in your gut are ___ a. spirochetes b. chlamydias c. cyanobacteria d. proteobacteria

All \(\quad\) are intracellular parasites of vertebrates. a. spirochetes b. chlamydias c. cyanobacteria d. proteobacteria

Some Gram-positive bacteria (e.g., Bacillus anthracis) survive harsh conditions by forming a(n) ___. a. pilus b. heterocyst c. endospore d. plasmid

Only ___ reproduce by prokaryotic fission. a. viruses b. archaeans c. bacteria d. both b and c

DNA or RNA may be the genetic material of ___. a. a bacterium b. a prion c. a virus \(d\). an archaean

A viroid consists entirely of ____ a. a DNA b. RNA c. protein d. lipids

Bacteriophages can multiply by ___ a. prokaryotic fission c. a lysogenic pathway b. a lytic pathway d. both b and c

Match the terms with their most suitable description. $$ \text { archaean } \quad \quad\quad\quad\quad \text { a. infectious protein } $$ $$ \text { bacteria } \quad \quad\quad\quad\quad \text { b. nonliving infectious particle; nucleic acid core, protein coat } $$ $$ \text { virus } \quad \quad\quad\quad\quad \text { c. involved in conjugation } $$ $$ \text { plasmid } \quad \quad\quad\quad\quad \text { d. prokaryotes that most closely resemble eukaryotes } $$ $$ \text { extreme halophile } \quad \quad\quad\quad\quad \text { e. most common prokaryotic cells } $$ $$ \text { prion } \quad \quad\quad\quad\quad \text { f. small circle of bacterial DNA } $$ $$ \text { sex pilus } \quad \quad\quad\quad\quad \text { g. salt lover } $$