biol-1406-7

biol-1406-7 - 4) Which of the following types of molecules...

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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 (Figure 7.1) with its description. 5) peripheral protein 6) cholesterol 7) fiber of the extracellular matrix 8) microfilament of the cytoskeleton 9) glycolipid 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. 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) 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. 14) 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.
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E) They have hydrophilic tails in the interior of the membrane. 16) 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 19) All of the following are functions of integral membrane proteins except *A) protein synthesis. B) active transport. C) hormone reception. D) cell adhesion. E) cytoskeleton attachment. 21) Which of the following is correct about integral membrane proteins? A) They lack tertiary structure. B) They are loosely bound to the surface of the bilayer. *C) They are usually transmembrane proteins. D) They are not mobile within the bilayer. E) They serve only a structural role in membranes. 22) Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes? A) facilitated diffusion of molecules down their concentration gradients B) active transport of molecules against their concentration gradients C) maintaining the integrity of a fluid mosaic membrane D) maintaining membrane fluidity at low temperatures *E) a cell's ability to distinguish one type of neighboring cell from another 23) What is one of the functions of cholesterol in animal cell membranes? A) facilitates transport of ions
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biol-1406-7 - 4) Which of the following types of molecules...

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