BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An octapeptide composed of four repeating glycylalanyl units has:
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one free amino group on an alanyl residue
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one free amino group on an alanyl residue and one free carboxyl group on a glycyl residue
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one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue
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two free amino and two free carboxyl groups
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Explanation:
Detailed explanation-1: -An octapeptide composed of four repeating glycylalanyl units has one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue.
Detailed explanation-2: -All known octapeptides contain a large hydrophobic residue (phenylalanine, leucine, or isoleucine) at position − 8, and a small hydroxylated residue (serine or threonine) or glycine at position − 5, relative to the N terminus of the mature protein (28, 29) (Fig.
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