ch 8 membrane structure and function (1)

ch 8 membrane structure and function (1) - SHORT ANSWER...

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SHORT ANSWER. Write the word or phrase that best completes each 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) Membranes are made of lipids because substances that dissolve in lipids enter cells more rapidly than lipid-insoluble substances. 2) Made artificial membranes by adding phospholipids dissolved in benzene to water. 3) The first to propose that cell membranes are phospholipid bilayers. 4) Membranes are a phospholipid bilayer between two layers of globular protein. 5) The membrane is a mosaic of protein molecules bobbing in a fluid layer of phospholipids. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 6) Which of the following types of molecules are the major structural components of the cell membrane? A) glycoproteins and cholesterol B) phospholipids and cellulose C) nucleic acids and proteins D) proteins and cellulose E) phospholipids and proteins SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. For the following questions, match the labeled component of the cell membrane (Figure 8.1) with its description. Figure 8.1 7) peripheral protein 8) cholesterol 9) fiber of the extracellular matrix 10) filament of the cytoskeleton 11) glycolipid MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 12) All of the following molecules are part of the cell membrane except A) protein. B) phosphate group. C) steroid. D) nucleic acids. E) lipid. 13) The presence of cholesterol in the plasma membranes of some animals A) enables the animal to remove hydrogen atoms from saturated phospholipids. B) makes the animal more susceptible to circulatory disorders. C) makes the membrane less flexible, so it can sustain greater pressure from within the cell. D) enables the membrane to stay fluid more easily when cell temperature drops. E) enables the animal to add hydrogen atoms to unsaturated phospholipids. 14) According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? A) They are free to depart from the membrane and dissolve in the surrounding solution.
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B) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. C) They frequently flip-flop from one side of the membrane to the other. D) They can move laterally along the plane of the membrane. E) They have hydrophilic tails in the interior of the membrane.
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This note was uploaded on 04/03/2012 for the course BI, HEALTH 251 taught by Professor N/a during the Spring '12 term at MD University College.

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ch 8 membrane structure and function (1) - SHORT ANSWER...

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