C8e_07_Test_Bank - Biology, 8e (Campbell) Chapter 7...

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Biology, 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel Answer: E Topic: Concept 7.1 Skill: Knowledge/Comprehension 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel Answer: A Topic: Concept 7.1 Skill: Knowledge/Comprehension 3) Who proposed that the membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel Answer: D Topic: Concept 7.1 Skill: Knowledge/Comprehension 4) Which of the following types of molecules are the major structural components of the cell membrane? A) phospholipids and cellulose B) nucleic acids and proteins C) phospholipids and proteins D) proteins and cellulose 1
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E) glycoproteins and cholesterol Answer: C Topic: Concept 7.1 Skill: Knowledge/Comprehension For the following questions, match the labeled component of the cell membrane (Figure 7.1) with its description. Figure 7.1 5) peripheral protein Answer: D Topic: Concept 7.1 Skill: Knowledge/Comprehension 6) cholesterol Answer: E Topic: Concept 7.1 Skill: Knowledge/Comprehension 7) fiber of the extracellular matrix Answer: A Topic: Concept 7.1 Skill: Knowledge/Comprehension 8) microfilament of the cytoskeleton Answer: C Topic: Concept 7.1 Skill: Knowledge/Comprehension 2
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9) glycolipid Answer: B Topic: Concept 7.1 Skill: Knowledge/Comprehension 10) When biological membranes are frozen and then fractured, they tend to break along the middle of the bilayer. The best explanation for this is that A) the integral membrane proteins are not strong enough to hold the bilayer together. B) water that is present in the middle of the bilayer freezes and is easily fractured. C) hydrophilic interactions between the opposite membrane surfaces are destroyed on freezing. D) the carbon-carbon bonds of the phospholipid tails are easily broken. E) the hydrophobic interactions that hold the membrane together are weakest at this point. Answer: E Topic: Concept 7.1 Skill: Application/Analysis 11) 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.
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C8e_07_Test_Bank - Biology, 8e (Campbell) Chapter 7...

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