Asbestos is a material that was once used extensively in construction. One risk

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Asbestos is a material that was once used extensively in construction. One risk from working in a building that contains asbestos is the development of asbestosis caused by the inhalation of asbestos fibers. Cells will take up a by phagocytosis, but are not able to degrade it. As a result, asbestos fibers accumulate in sbestos A) the Golgi apparatus B) nuclei C) peroxisomes D) lysosomes 35) If plant cells are grown on media containing radioactively labeled thymine for one generation, radioactively labeled macromolecules will be detected in which of the following A) only in the nucleus B) only in the nucleus and mitochondria C) only in the nucleus and chloroplasts D) in the nucleus, mitochondria, and chloroplasts 36) According to the fluid mosaic model of cell membranes, phospholipids A) can move laterally along the plane of the membrane B) frequently flip-flop from one side of the membrane to the other C) occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane D) have hydrophilic tails in the interior of the membrane 37) An animal cell lacking carbohydrates on the external surface of its plasma membrane would likely be impaired in which function? A) transporting ions against an electrochemical gradient B) cell-cell recognition C) attaching the plasma membrane to the cytoskeleton D) establishing a diffusion barrier to charged molecules 37) What kinds of molecules pass through a cell membrane most easily? A) large and hydrophobic B) small and hydrophobic C) large polar D) small and ionic 38) The voltage across a membrane is called the A) chemical gradient B) membrane potential C) osmotic potential D) electrochemical gradient 39) Which of the following membrane activities requires energy from ATP hydrolysis? A) facilitated diffusion of chloride ions across the membrane through a chloride channel B) movement of Nat ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid. C) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell D) movement of carbon dioxide out of a parameciunm 40) The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal. -Sucrose Sucrose 2 M 1 M Glucose 1 M Glucose 2 M Which of the following will be true when the system illustrated above reaches equilibrium? A) The concentration of sucrose on side A will be greater than the concentration of sucrose on side B B) The water level will be higher in side A than in side B C) The water levels will be unchanged. D) The water level will be higher in side B than in side A.

Explanation / Answer

Answer:

34). D). Lysosomes

35). D). in the nucleus, mitochondria and chloroplasts

36). A). can move laterally along the plane of the membrane.

37). B). Cell-Cell recognition

37). B). small and hydrophobic

38). B). Membrane potential

39). B). Movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid.

40). B). The water level is higher in side A than in side B.

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