1) For a protein to be an integral membrane protein, it would have to be. A) hydrophilic B) hydrophobic C) exposed on only one surface of the membrane D) amphipathic, with at least one hydrophobic region 2) Cell membranes are asymmetrical. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature? A) Proteins only function on the cytoplasmic side of the cell membrane, which results in the membrane's asymmetrical nature. B) Since cell membranes communicate signals from one organism to another, the cell membranes must be asymmetrical. C) Since the cell membrane forms a border between one cell and another, the membrane must be asymmetrical The two sides of a cell membrane face different environments and carry out different functions. leave blanks. 3) In what way do the membranes of a eukaryotic cell vary? A Certain proteins are unique to each membrane. B) Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces facing the cytoplasm. C) Only certain membranes of the cell are selectively permeable. D) Phospholipids are found only in certain membranes. 4) Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a membrane mor fluid at lower temperatures? A Unsaturated fatty acids are more polar than saturated fatty acids. B) Unsaturated fatty acids have a higher cholesterol content and, therefore, more cholesterol in membranes. C) The double bonds block interaction among the hydrophilic head groups of the lipids. D) The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly. 5) What kinds of molecules pass through a cell membrane most easily? A) large polar C) small and hydrophobic B) large and hydrophobic D) ionic 6) Which of the following most accurately describes selective permeability? A) Only certain molecules can cross a cell membrane. B) An input of energy is required for transport. C) There must be a concentration gradient for molecules to pass through a membrane. D) Lipid-soluble molecules pass through a membrane. 7) Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? C) an amino acid B) glucose A) D) CO