07_TestBank_TB[1] (1) - Biology, 7e (Campbell) Chapter 7:...

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Biology, 7e (Campbell) Chapter 7: Membrane Structure and Function Chapter Questions For the following questions, match the labeled component of the cell membrane (Figure 7.1) with its description. Figure 7.1 1) peripheral protein Answer: D Topic: Concept 7.1 Skill: Knowledge 2) cholesterol Answer: E Topic: Concept 7.1 Skill: Knowledge 3) fiber of the extracellular matrix Answer: A Topic: Concept 7.1 Skill: Knowledge 4) microfilament of the cytoskeleton Answer: C Topic: Concept 7.1 Skill: Knowledge 5) glycolipid Answer: B Topic: Concept 7.1 Skill: Knowledge 6) All of the following molecules are part of the cell membrane except 1
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B) nucleic acids. C) proteins. D) phosphate groups. E) steroids. Answer: B Topic: Concept 7.1 Skill: Knowledge 7) The presence of cholesterol in the plasma membranes of some animals A) enables the membrane to stay fluid more easily when cell temperature drops. B) enables the animal to remove hydrogen atoms from saturated phospholipids. C) enables the animal to add hydrogen atoms to unsaturated phospholipids. D) makes the membrane less flexible, allowing it to sustain greater pressure from within the cell. E) makes the animal more susceptible to circulatory disorders. Answer: A Topic: Concept 7.1 Skill: Comprehension 8) According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? A) They can move laterally along the plane of the membrane. B) They frequently flip-flop from one side of the membrane to the other. C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. D) They are free to depart from the membrane and dissolve in the surrounding solution. E) They have hydrophilic tails in the interior of the membrane. Answer: A Topic: Concept 7.1 Skill: Comprehension 9) The lateral mobility (fluidity) of lipids and proteins in membranes is a consequence of A) lack of covalent bonds between the lipid and protein components of the membrane. B) weak hydrophobic interactions among the components in the interior of the membrane. C) the presence of liquid water in the interior of the membrane. D) A and B only E) A, B, and C Answer: D Topic: Concept 7.1 Skill: Comprehension 10) What is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? A) by increasing the percentage of unsaturated phospholipids in the membrane B) by increasing the percentage of cholesterol molecules in the membrane C) by decreasing the number of hydrophobic proteins in the membrane D) A and B only E) A, B, and C Answer: A Topic: Concept 7.1 Skill: Comprehension 11) The surface of an integral membrane protein would be best described as A) hydrophilic.
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07_TestBank_TB[1] (1) - Biology, 7e (Campbell) Chapter 7:...

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