Q:

The mammalian cell membrane

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The mammalian cell membrane.


  1. Is seen as an optically dense line using light microscopy.
  2. Consists mainly of protein.
  3. Is more permeable to fat- than to water-soluble particles.
  4. Contains enzymes.
  5. Contains the receptors for steroid hormones.

All Answers

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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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