Which of the following is an example of passive transport? a. Facilitated diffusion b. The sodium-potassium pump c. Phagocytosis d. Exocytosis e. Pinocytosis Which of the following statements about diffusion is false? a. Diffusion depends on the intrinsic kinetic energy of molecules. b. Diffusion continues until the concentrations are in equilibrium. c. In diffusion, molecules move from areas of greater concentration to areas of lesser concentration. d. Diffusion is a random process. c. Simple diffusion depends upon specific carrier proteins. A concentration gradient of glucose across a membrane means that a. there are more moles of glucose on one side of the membrane than on the other. b. glucose molecules are more crowded on one side of the membrane than on the other. c. there is less water on one side of the membrane than on the other. d. the glucose molecules are chemically more tightly bonded on one side than on the other. c. there are more glucose molecules within the membrane than outside the membrane. The difference between osmosis and diffusion is that a. diffusion is passive transport, whereas osmosis is active transport. b. only in diffusion do molecules move from areas of high concentrations to areas of low concentration. c. only diffusion refers to the movement of materials across a semipermeable membrane. d. osmosis refers specifically to the movement of water, whereas diffusion is the movement of molecules. e. the process of osmosis varies according to the kinds of particles present. When a severely dehydrated patient is brought to the hospital, an IV of normal saline is started immediately. Distilled water is not used because a. it would cause water to leave the cells of the patient and the cells would collapse. b. nutrients are provided by the saline. c. it would cause the patient’s blood cells to swell and eventually burst. d. normal saline is more economical. c. the distilled water might be contaminated by bacteria.
