Biochemistry 3381A Study Guide - Quiz Guide: Sterol, Electrochemical Gradient, Phytosterol
27 May 2020
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Sterols, especially cholesterol, are also essential to the stability of the cell membrane. It maintains flexibility and stability of the membrane over a range of temperatures. They are present in animals, plants and fungi: phytosterols. Sterols found in plants interfere with the absorption of excess cholesterol from the diet. Absorbed into blood accumulation: ergosterol is a sterol found in fungi, it has a similar function as cholesterol in animals. Saturated transporter = when all solute binding sites are occupied rate of transport maximal. Binding of solute can be blocked by competitive and by non-competitive inhibitors: channels. Channels form pores in the membrane and when open specific molecules can pass through it, this transport is much faster than the transport wit transporters. Concentration gradient drives passive transport and determines its direction. Electrochemical gradient favors entry of positively charged ions. Primary transport: directly derived from atp (pumps) Secondary transport: other source of energy (coupled transporters)
