6. An ion channel is a transport protein that a. allows ions to move across the cell membrane b. pumps ions OUT of a cell ONLY c. moves substances against a concentration gradient d. transports sugars across the membrane 7. Proteins embedded in the cell membrane that bind to signal molecules are known as a. marker proteins b. receptor proteins c. signal proteins d. transport proteins 8. The cell membrane is best described as a. a waterproof layer of polysaccharides connected by short chains of amino acids. b. a web of protein fibers. c. a double layer of phospholipids. d. a thick layer of proteins and carbohydrates.
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