In an aqueous environment the most stable tertiary conformation is that in which _________ amino acids are buried inside the conformation?
Correct answer: A. Hydrophobic
- A. Hydrophobic
- B. Hydrophilic
- C. Basic
- D. None of these
Explanation
In water, hydrophobic side chains tend to avoid contact with water and become buried in the interior of a folded protein. Hydrophilic and charged side chains are more likely to remain exposed, where they can interact with water. Students may choose b because hydrophilic amino acids interact well with water, but that is precisely why they are usually exposed rather than buried.
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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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