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State whether the following is true or false.
Membrane proteins are fixed rigidly in position within the bilayer.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

Many drift laterally, as the classic experiment fusing mouse and human cells demonstrated when their surface proteins intermingled within an hour. Some are anchored by the cytoskeleton, but that is a restriction rather than the rule.

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