Which of the following statements is TRUE about membranes? Cellular membranes in humans typically contain triacylglycerols. Biological membranes contain carbohydrates on the exterior of the lipid bilayer. Cholesterol causes membranes to be more fluid at high temperatures. The fluidity of biological membranes is affected by the presence of sugar headgroups.
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- Membranes are mainly phospholipids, with cholesterol and proteins; triacylglycerols are energy storage lipids, not typical membrane lipids. - Carbohydrates appear on the exterior of the bilayer as glycoproteins and glycolipids. - Cholesterol modulates fluidity: Show more…
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Select all of the true statements concerning biological membranes: Group of answer choices: Biological membranes have a homogeneous glycerophospholipid content. As temperatures grow colder, animals will adapt by changing the fatty acid composition of cell membranes to include shorter chains with greater unsaturation. Carbohydrates are found only on the intracellular side of the plasma membraned. Integral membrane proteins penetrate or span the lipid bilayer, interacting with hydrophobic lipid acyl chains. Transverse diffusion of lipids occurs very slowly whereas lateral diffusion occurs very rapidly.
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Which of these statements about the composition of biological membranes is false? Group of answer choices In a given eukaryotic cell type (e.g., a hepatocyte), all intracellular membranes have essentially the same complement of lipids and proteins. The carbohydrate found in membranes is virtually all part of either glycolipids or glycoproteins. The plasma membranes of the cells of vertebrate animals contain more cholesterol than the mitochondrial membranes. The ratio of lipid to protein varies widely among cell types in a single organism.
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Which of the following statements is not true? Biological membranes (a) are composed partly of amphipathic lipids (b) have hydrophobic and hydrophilic regions (c) are typically in a fluid state (d) are made mainly of lipids and of proteins that lie like thin sheets on the membrane surface (e) function in signal transduction
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