Which statement about membranes is TRUE? Group of answer choices Membranes have dynamic compositions. Within a species, different organelles can have distinct membrane compositions. All of the answers are true The different faces of a membrane can have distinct compositions. Membranes are specialized in their lipid and protein compositions.
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- Statement 1: Membranes have dynamic compositions. - This statement is true. Membranes, especially in biological systems, can change their composition over time in response to various cellular conditions and signals. - Statement 2: Within a species, different Show more…
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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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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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The membrane bilayer has unique properties based on its composition. Which of the following describe(s) this characteristic? Covalent bonding between neighboring fatty acid chains helps to stabilize bilayers, making them more rigid. Ether lipids are correlated to the presence of membrane rafts, giving specific areas of a bilayer unique function. Eicosanoids are stored in the biological membranes of higher organisms for the purpose of mediating permeability. ABC transporter proteins like the MDR transporter are used to remove fatty acid chains from membrane lipids. Lateral diffusion of lipids in the membrane must be mediated by protein activity. The lipid composition of a membrane bilayer will not be affected by temperature changes. More than one of these are true. None of these is true. Triacylglycerols are found in the bilayers of higher organisms.
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