Which structural organization is most common in globular proteins____________?
Correct answer: C. Tertiary
- A. Primary
- B. Secondary
- C. Tertiary
- D. Quaternary
Explanation
Globular proteins usually fold into a compact three-dimensional shape formed by interactions among amino acid side chains, which is their tertiary structure. Secondary structure refers mainly to local alpha helices and beta sheets, while quaternary structure requires multiple polypeptide chains. Students may choose b because alpha helices and beta sheets are visible parts of globular proteins, but they do not describe the complete common organization.
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About Proteins
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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