Biology

Biology, 02.07.2019 09:10, jk8

Why do cells need to use transport proteins to function? a. transport proteins surround the nucleus for protection. b. transport proteins prevent the cells from dissolving. c. carbohydrates cannot pass directly through the cell membrane. d. nonpolar molecules cannot pass through the cell membrane.

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Biology, 28.06.2019 13:50, lilroach4

Glucose provides energy for cells. different cells have different mechanisms for glucose intake. intestinal cells contain proteins that transport glucose against its concentration gradient. these proteins couple the movement of glucose to the movement of sodium down its concentration gradient. red blood cells have transporter proteins embedded in their membranes. when bound by a glucose molecule, these proteins change shape and allow glucose to move down its concentration gradient into the cell. based on this information, what type of transport is used for glucose in blood and intestinal cells? a. blood cells take in glucose by active transport and intestinal cells take in glucose by passive transport. b. both blood and intestinal cells take in glucose by active transport. c. both blood and intestinal cells take in glucose by passive transport. d. blood cells take in glucose by passive transport and intestinal cells take in glucose by active transport.

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Biology, 25.09.2019 23:00, chandranewlon

Glucose is not able to pass through a semi-permeable cell membrane. if the cells need sugar to make atp and carry out cellular processes, how does the sugar get into the cell? a) passive transport by diffusion through proteins b) active transport using atp and carrier proteins c) passive transport by osmosis through the proteins d) active transport using a process called phagocytosis

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