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Name ______________________________ Class ___________________ Date __________________ Assessment Quiz Section: Cell Transport In the space provided, write the letter of the description that best matches each term. _____ 1. osmosis _____ 2. carrier protein _____ 3. equilibrium _____ 4. sodium-potassium pump _____ 5. concentration gradient _____ 6. diffusion a. state that exists when the concentration of a substance is the same throughout a space b. movement of particles from a region of higher concentration to a region of lower concentration c. substance made of amino acids that moves substances across a cell membrane d. substance that requires energy to transport sodium ions and potassium ions across a cell membrane e. movement of water across a selectively permeable membrane from a region of higher concentration to a region of lower concentration f. difference in concentration of a substance across a distance In the space provided, write the letter of the response that best answers each question. _____ 7. What is the difference between active transport and passive transport? a. Active transport requires energy, and passive transport does not. b. Active transport requires carrier proteins, and passive transport does not. c. Active transport moves substances down their concentration gradient, and passive transport does not. d. Both (a) and (c) _____ 8. Why is osmosis important? a. to transport proteins across the cell membrane b. to aid the movement of large substances in and out of a cell c. to maintain the water balance in a cell d. All of the above _____ 9. Which substances pass directly through the cell membrane? a. small, polar molecules c. sugars b. small, nonpolar molecules d. amino acids Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 26 Cells and Their Environment