Home › AP Biology › Biology › Structure and Function of Plasma Membranes › A phospholipid molecule is built on a backbone of:
A phospholipid molecule is built on a backbone of:
ARibose
BCysteine
CPyruvate
DGlycerol
Answer & Solution
Correct answer: D. Glycerol
1. Every phospholipid has the same underlying frame.
2. That frame carries three carbons.
3. A phospholipid molecule consists of a three-carbon glycerol backbone.
4. Two fatty acids attach at carbons 1 and 2, and a phosphate-containing group at the third.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_
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