Chapter 20

DNA or RNA may be the genetic material of ______. a. a bacterium b. a viroid c. a virus d. an archaeon

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

Bacteriophages can kill their host quickly by ______. a. binary fission b. a lytic pathway c. a lysogenic pathway d. both b and c

The genetic material of HIV is ______. a. DNA b. RNA c. protein d. lipids

______ do not reproduce sexually. a. Eukaryotes b. Bacteria c. Archea d. \(b\) and \(c\)

One cell transfers a plasmid to another by ______. a. binary fission b. transformation c. conjugation d. the lytic pathway

All ______ are oxygen-releasing photoautotrophs. a. spirochetes b. chlamydias c. cyanobacteria d. proteobacteria

Bacteria that serve as decomposers are ______. a. photoautotrophs b. photoheterotrophs c. chemoautotrophs d. chemoheterotrophs

Some ______ can cause cancer in humans. a. viruses b. bacteria c. viroids d. a and b

Formation of \(a(n)\) ______ allows some soil bacteria to survive adverse conditions. a. pilus b. nucleoid c. endospore d. plasmid

______ reproduce by binary fission. a. Viruses b. Archaea c. Bacteria d. both b and c

A plasmid is a circle of ______. a. \(\mathrm{RNA}\) b. DNA c. either RNA or DNA

Which of these diseases is caused by bacteria? a. flu b. AIDS c. measles d. syphilis

A worldwide outbreak of a disease is \(a(n)\) ______.

Match the terms with their most suitable description. _____ methanogen _____ nucleoid _____ retrovirus _____ plasmid _____ extreme halophile _____ viroid _____ sex pilus a. infectious RNA b. has RNA genome, protein coat c. draws cells together d. releases methane gas e. region with DNA f. circle of nonchromosomal DNA g. salt lover