Cell Membranes Typically Display Asymmetry

question 94

Multiple Choice

Cell membranes typically display asymmetry. What does this mean?

• A) The two leaves of a bilayer contain different collections of lipids and proteins.
• B) The fatty acyl chain on C-1 of a membrane lipid is usually different from that on C-3.
• C) Only one stereoisomer is ever seen at the chiral C-2 of the glycerol residue in a membrane lipid.
• D) Membrane lipids only have cis double bonds, never trans .

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