Chapter 7 Questions - Ch 7 Multiple Choice Identify the...

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Ch 7 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. For the following questions, match the membrane model or description with the scientist(s) who proposed the model. Each choice may be used once, more than once, or not at all. A. H. Davson and J. Danielli B. I. Langmuir C. C. Overton D. S. Singer and G. Nicolson E. E. Gorter and F. Grendel ____ 1. The first to propose that cell membranes are phospholipid bilayers. a. A b. B c. C d. D e. E ____ 2. Membranes are a phospholipid bilayer between two layers of hydrophilic proteins. a. A b. B c. C d. D e. E ____ 3. The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids. a. A b. B c. C d. D e. E ____ 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 e. glycoproteins and cholesterol For the following questions, match the labeled component of the cell membrane in the figure below with its description.
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____ 5. peripheral protein a. A b. B c. C d. D e. E ____ 6. cholesterol a. A b. B c. C d. D e. E ____ 7. fiber of the extracellular matrix a. A b. B c. C d. D e. E ____ 8. microfilament of the cytoskeleton a. A b. B c. C d. D e. E ____ 9. glycolipid a. A b. B c. C d. D e. E ____ 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.
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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. ____ 11. All of the following molecules are part of the cell membrane except a. lipids. b. nucleic acids. c. proteins. d. phosphate groups. e. steroids. ____ 12. The original model for the bilayer structure of cell membranes, which was prepared in the 1920s, was based on which of the following? a. detailed electron micrographs of freeze-fractured membranes b. the presence of proteins as a functional component of biological membranes c. the observation that all membranes contain phospholipids and proteins d. the understanding that phospholipids are amphipathic molecules e. A and B only ____ 13. 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.
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Chapter 7 Questions - Ch 7 Multiple Choice Identify the...

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