membranes:transport.rtf - Name Date A B C D E A B C D E A B...

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Name: __________________________ Date: _____________ 1.Which one of the following statements about membranes is true ? A) Most plasma membranes contain more than 70% proteins. B) Sterol lipids are common in bacterial plasma membranes. C) Sterol lipids are common in human cell plasma membranes. D) Sterol lipids are common in plant cell plasma membranes. E) The plasma membranes of all cell types within a particular organism have basically the same lipid and protein composition. 2.The inner (plasma) membrane of E. coli is about 75% lipid and 25% protein by weight. How many molecules of membrane lipid are there for each molecule of protein? (Assume that the average protein is M r 50,000 and the average lipid is 750.) 3.Which of these statements about the composition of biological membranes is false ? 4.Which of these statements about the composition of membranes is true ? 5.Membrane proteins: A) are sometimes covalently attached to lipid moieties. B) are sometimes covalently attached to carbohydrate moieties. C) are composed of the same 20 amino acids found in soluble proteins. Page 1
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D) diffuse laterally in the membrane unless they are anchored E) have all of the properties listed above. 6.Peripheral membrane proteins:
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  • Fall '08
  • Staff
  • Membrane protein

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