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Cholesterol belongs to which class of lipid?
AA plant wax ester
BA steroid alcohol
CA triglyceride fat
DA phospholipid
Answer & Solution
Correct answer: B. A steroid alcohol
1. Steroids are set apart from other lipids by a fused ring structure.
2. All steroids have four linked carbon rings.
3. Cholesterol has those four rings plus a short tail, so it is a steroid.
4. It is grouped with the lipids because, like them, it is hydrophobic and insoluble in water.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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