alleryStart learning →Which membrane is reported as 76 percent protein and only 24 percent lipid?
AThe myelin sheath of a peripheral nerve
BThe plasma membrane of a red blood cell
CThe inner membrane of the mitochondrion
DThe plasma membrane of a typical cell
Answer & Solution
Correct answer: C. The inner membrane of the mitochondrion
1. The mitochondrial inner membrane contains 76 percent protein and only 24 percent lipid.
2. Myelin sits at the opposite extreme with 18 percent protein and 76 percent lipid, so the 76 figure attaches to different components in the two cases.
3. A typical human cell plasma membrane is about 50 percent protein by mass.
4. The plasma membrane of human red blood cells is quoted as 30 percent lipid.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.1 Components and Structure_
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