The following is an example of a globular protein:
Correct answer: C. Hemoglobin
- A. Keratin
- B. Collagen
- C. Hemoglobin
- D. Histone
Explanation
Haemoglobin folds into a compact soluble ball with hydrophilic residues outside, which is what lets it dissolve in the cytoplasm of a red cell and carry oxygen. Keratin and collagen are fibrous structural proteins, long and insoluble. Histones are globular too, which makes the last option arguable, but haemoglobin is the standard textbook example the paper is looking for.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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