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The mammalian cell membrane A. Is seen as an optically dense line using light microscopy. B. Consists mainly of protein. C. Is more permeable to fat- than to water-soluble particles. D. Contains enzymes. E. Contains the receptors for steroid hormones. |
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Answer» A. False It is beyond the resolution of the light microscope. B. False It consists mainly of lipid. C. True Fat-soluble particles dissolve easily in the lipid matrix. D. True These are involved in active transport. E. False Steroid hormones cross the membrane and act intracellularly. |
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