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MULTIPLE CHOICE 1. Viruses are a. infectious agents that infect exclusively multicellular organisms. b. noncellular particles that take over the metabolism of a cell to generate more virus particles. c. pathogens that replicate in complex growth media. d. cellular particles that belong to the archaea domain. e. microbes that consist of lipid membrane–enclosed genomes. ANS: B DIF: Easy REF: 1.1 OBJ: 1.1a Recall the definition of a microbe 1.1b List examples of microbes MSC: Remembering 2. Analysis of DNA sequences reveals a. the ancient convergence of two cell types (i.e., prokaryotes and eukaryotes). b. that prokaryotes and eukaryotes evolved from a common ancestral cell. c. that bacteria share a common ancestor with archaea but not with eukarya. d. that prokaryotes are cells with a nucleus. e. that the genome of Haemophilus influenzae has about 2 billion base pairs. ANS: B DIF: Easy REF: 1.1 OBJ: 1.1d Explain the implications of microbial genome sequencing MSC: Understanding 3. Which of these groups are considered to be microbes but NOT considered to be cells? a. viruses d. protists b. bacteria e. filamentous fungi c. archaea ANS: A DIF: Easy REF: 1.1 OBJ: 1.1a Recall the definition of a microbe 1.1c Describe some problems with the definition of a microbe MSC: Understanding 4. A microbe is commonly defined as a ________ that requires a microscope to be seen. a. virus d. multicellular eukaryote b. bacterium e. living organism c. single-cellular prokaryote ANS: E DIF: Easy REF: 1.1 OBJ: 1.1a Recall the defi
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