C8e_27_Test_Bank

C8e_27_Test_Bank - Biology, 8e (Campbell) Chapter 27...

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Biology, 8e (Campbell) Chapter 27 Bacteria and Archaea Multiple-Choice Questions 1) Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true? A) They are gram-negative. B) They are subject to lysis in hypotonic conditions. C) They lack a cell membrane as well. D) They undergo ready fossilization in sedimentary rock. E) They possess typical prokaryotic flagella. Answer: B Topic: Concept 27.1 Skill: Knowledge/Comprehension 2) Though plants, fungi, and prokaryotes all have cell walls, we place them in different taxa. Which of these observations comes closest to explaining the basis for placing these organisms in different taxa, well before relevant data from molecular systematics became available? A) Some closely resemble animals, which lack cell walls. B) Their cell walls are composed of very different biochemicals. C) Some have cell walls only for support. D) Some have cell walls only for protection from herbivores. E) Some have cell walls only to control osmotic balance. Answer: B Topic: Concept 27.1 Skill: Knowledge/Comprehension 3) Which is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell? A) plasma membrane B) capsule C) cell wall D) nucleoid region E) pili Answer: A Topic: Concept 27.1 Skill: Knowledge/Comprehension 4) Which statement about bacterial cell walls is false? A) Bacterial cell walls differ in molecular composition from plant cell walls. B) Cell walls prevent cells from bursting in hypotonic environments. C) Cell walls prevent cells from dying in hypertonic conditions. 1
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D) Bacterial cell walls are similar in function to the cell walls of many protists, fungi, and plants. E) Cell walls provide the cell with a degree of physical protection from the environment. Answer: C Topic: Concept 27.1 Skill: Knowledge/Comprehension 5) Which of these is the most common compound in the cell walls of gram-positive bacteria? A) cellulose B) lipopolysaccharide C) lignin D) peptidoglycan E) protein Answer: D Topic: Concept 27.1 Skill: Knowledge/Comprehension 6) Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin? A) mycoplasmas B) gram-positive bacteria C) archaea D) gram-negative bacteria E) endospore-bearing bacteria Answer: B Topic: Concept 27.1 Skill: Knowledge/Comprehension 7) The predatory bacterium, Bdellovibrio bacteriophorus , drills into a prey bacterium and, once inside, digests it. In an attack upon a gram-negative bacterium that has a slimy cell covering which can inhibit phagocytosis, what is the correct sequence of structures penetrated by B. bacteriophorus
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This note was uploaded on 01/30/2011 for the course BIO 113 taught by Professor Anderson during the Spring '10 term at Albright College.

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C8e_27_Test_Bank - Biology, 8e (Campbell) Chapter 27...

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