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- What is the primary function of carbohydrates attachedto the exterior of cell membranes?a. identification of the cellb. flexibility of the membranec. strengthening the membraned. channels through membraneCholesterol Is _________ by Enzymes in the _______ and ER Membrane.An ion gate in the plasma membrane that opens or closes when a chemical binds to it is called a/an ____________ .
- Plasma membrane is permeable toa) ATPb) Glucosec) K+d) UreaSome cells lining tubules in the kidneymaintain normal cell volume bysynthesizing organic solutes. Where inthe kidney would you expect to findthese cells? Explain.When William H. was helping victims after a devastating earthquake in a region not prepared to swiftly set up adequate temporary shelter, he developed severe diarrhea. He was diagnosed as having cholera, a disease transmitted through unsanitary water supplies contaminated by fecal material from infected indiv iduals. The toxin produced by cholera bacteria causes Cl- channels in the lurninal membranes of the intestinal cells to stay open, thereby increasing the secretion of Cl- from the cells into the intestinal tract lumen. By what mechanisms would Na+ and water be secreted into the lumen in conjunction with Cl- secretion? How does this secretory response account for the severe diarrhea that is characteristic of cholera?
- Most of a membranes diverse functions are carried out by ________ . a. proteins c. nucleic acids b. phospholipids d. hormonesHydrophobic molecules that dissipate osmotic gradients byinserting themselves into a membrane and forming a channelare called _____________.Erythrocyte glucose transporter is an example ofa) Ion driven active transportb) Facilitated diffusionc) Active transportd) Simple diffusion