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Carbohydrates, lipids, nucleic acids and one other group make up the four major classes of biological macromolecules. The fourth is:
AVitamins
BSteroids
CProteins
DMinerals
Answer & Solution
Correct answer: C. Proteins
1. Macromolecules are the large carbon-based molecules a cell builds from monomers.
2. There are four major classes of them: carbohydrates, lipids, proteins and nucleic acids.
3. Vitamins, steroids and minerals are not classes of macromolecule; steroids are one kind of lipid.
4. So the missing fourth class is proteins.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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