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You also measure the atp concentration inside the

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Unformatted text preview: trients into the cell. regulating passage of wastes outside of the cell. site for electron transport steps in cellular respiration. provide mechanisms for cell adhesion (e.g., to nearby cells in tissues). All of the functions in A through D are true of eukaryotic plasma membranes. 27. Which of the following statements best describes the current (fluid ­mosaic) model of membrane structure? A. A phospholipid bilayer has hydrophilic proteins coating both sides of the bilayer. B. A phospholipid bilayer contains diverse proteins, including some embedded amphipathic proteins (i.e., contain hydrophobic and hydrophilic regions) that span the bilayer. C. Two layers of amphipathic proteins are interspersed with occasional patches of phospholipids. D. Membrane proteins contain only hydrophobic amino acids; membrane lipids include only hydrophobic hydrocarbons. 28. Which of the following conditions would decrease membrane fluidity? A. B. C. D. E. An increase in the number of C–C double bonds of fatty acids in the membrane lipids. A shorter chain length of fatty acids. Increased level of saturation of fatty acids. An increase in the environmental temperature. Two of the above conditions would decrease membrane fluidity. 29. In an experiment, you measure the concentration of a polar molecule inside and outside a cell. You find that the concentration is high and gradually increasing inside the cell. You also measure the ATP concentration...
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