question archive Which of the following membrane molecules is correctly matched to its function? receptor proteint helps the plasma membrane retain flexibility B
Which of the following membrane molecules is correctly matched to its function? receptor proteint helps the plasma membrane retain flexibility B
Subject:BiologyPrice: Bought3
Which of the following membrane molecules is correctly matched to its function? receptor proteint helps the plasma membrane retain flexibility B. transport proteins: catalyze intra- and extracellular reactions on the plasma membrane C. cholesterol: binds to external chemicals in order to regulate processes within the cell D. carbohydrate chains: provide a "fingerprint" for the cell so it can be identified by other cells Diffusion across the cell's outer membrane A requires ATP. B. occurs without the input of energy C. never occurs; all molecules cross the membrane within protein carriers. D. always results with the molecules moving from areas of low concentration to areas of high concentration. In passive transport: A. molecules move spontaneously from an area of high concentration to an area of low concentration. B. ATP is required to move especially large molecules or ions across a cell membrane. C. a transport protein moves one molecule against the concentration gradient, while another molecule moves down its gradient. D. molecules move from an area of low concentration to an area of high concentration. Which of the following describes simple diffusion? A. Hydrogen ions are pumped out of stomach lining cells with the use of ATP B. Oxygen moves through the cell membrane from an area of high concentration outside the cell into an area of lower concentration inside the cell. C. The salts in a laxative cause water to move from surrounding cells into the intestines D. Glucose is transported into the cell via a transport protein. What characteristic makes facilitated diffusion different from simple diffusion? A Simple diffusion only involves the movement of water across a semipermeable membrane. Facilitated diffusion requires the input of ATP. Facilitated diffusion requires the help of a transport protein. Simple diffusion moves molecules down a concentration gradient. How is osmosis across the cellular membrane controlled? A. Water is "chaperoned" through the cellular membrane by transporting protein carriers B. The membrane is impermeable to the solute, so water moves in and out of the cell to maintain a concentration equilibrium b or and exterior of the cell C. Osmosis does not occur across the it cannot be controlled. D. The interior of the cell receives chemical signals triggered by the glycoproteins outside the cell to tell it when to let water out
