42. Membrane proteins that allow passage of centain organic molecules or ions th

Question

42. Membrane proteins that allow passage of centain organic molecules or ions through a membrane are proteins d enzymes channel proteins b.receptor proteins 43. What is a calorie? c junction a. a measure of chemical enerey c a measure of the fat content of food b. a measure of kinetic energy d. a measure of the sugar content of food 44. What type of molecule makes up the bulk of a cell membrane? d cellulose a. carbohydrate 45. What is entropy? a. deactivation of an enzyme c activation of any protein b deactivation of a channel protein d. a measure of the non-usable energy in a system 46 The Fluid-Mosaic model describes the structure of a. a cell membrane b. the cytoplasm cthe nucleoplasm 47 What is an complex? b. an organelle that breaks down fatty acids d. an enzyme bound to its substrate a. a deactivated enzyme c. a structural protein 48. What do we call a plant cell with low turgor pressure? a. wilted b. osmotic c. dead d. dying 49. Describe the direction of solute movement during osmosis a. into the cell b. from hypotonic to hypertonic cout of the cell d. from hypertonic to hypotonic -50. What is plasmolysis? a. the digestion of large b. the polymerization of polypeptides c. the separation of a plant cell membrane from its cell wall d. a gap in the cell wall between adjacent plant cells

Explanation / Answer

42. (a) channel proteins.

Channel proteins are proteins across the plasma membrane which allow for passage of certain molecules, like ions or organic molecules. It works by changing the structural make up (conformation ).

43. a

44. C

45. D

46. A

47. D

48. A

49. D

50. C

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