,
, CHAPTER 1: Microbial Life: Origin and Discovery
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MULTIPLE CHOICE
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1. Viruses are: JU
a. infectious agents that infect multi-cellular organisms JU JU JU JU JU
b. noncellular particles that take over the metabolism of a cell to generate mor
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e virusparticles
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J
c. pathogens that replicate in complex growth media JU JU JU JU JU JU
d. cellular particles that belong to the archaea domain
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e. microbes that consist of lipid membrane enclosed genomes JU JU JU JU JU JU JU
ANS: B J DIF:U Easy REF: 1.1 JUJUJ U TOP: I.A | I.B J U JU JU
MSC: Remembering
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2. Analysis of DNA sequences reveals:
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a. the ancient convergence of two cell types, i.e., prokaryotes and eukar
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yotes
b. prokaryotes and eukaryotes evolved from a common ancestral cell JU JU JU JU JU JU JU JU
c. that bacteria share common ancestor with archaea, but not with euka
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rya
d. prokaryotes are cells with a nucleus JU JU JU JU JU
e. the genome of Haemophilus influenzae has about 2 billion base pairs
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ANS: B J DIF:U Easy REF: 1.1 JUJUJ U TOP: I.A | I.B J U JU JU
MSC: Remembering
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3. Which of these groups are considered to be microbes but NOT considered to be cells?
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a. viruses d. protists
b. bacteria e. filamentous fungi JU
c. archaea
ANS: A J DIF:U Easy REF: 1.1 JUJUJ U TOP: I.A.i J U
MSC: Remembering
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4. A microbe is commonly defined as:
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a. a virus that requires a microscope to be seen
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b. a bacterium that requires a microscope to be seen
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c. a single-
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cellular prokaryote that requires a microscope to be seen
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d. a multicellular eukaryote that requires a microscope to be se
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en
e. a living organism that requires a microscope to be seen
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ANS: E J DIF:U Easy REF: 1.1 JUJUJ U TOP: I.A.i | I.A.ii J U JU JU
MSC: Remembering
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5. Which one of the following statements regarding microbial cells is NOT true?
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a. Microbial cells acquire food, gain energy to build themselves, and respon
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d to JU
environmental change. JU