alleryStart learning →What structural feature do all steroids share?
AFour linked carbon rings in a fused structure
BTwo linked carbon rings and two fatty acid tails
CFour linked nitrogen rings in a fused structure
DThree linked carbon rings and a phosphate head
Answer & Solution
Correct answer: A. Four linked carbon rings in a fused structure
1. Steroids do not look like the other lipids, since they have a fused ring structure rather than chains.
2. All steroids have four linked carbon rings.
3. Several of them, cholesterol among them, also carry a short tail.
4. They are grouped with the lipids because they are hydrophobic and insoluble in water.
5. The rings are carbon rings, so the option naming nitrogen rings changes the chemistry.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.3 Lipids_
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