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Which amino acid has an r-group that forms a covalent bond with the polypeptide backbone, thereby restricting the flexibility of the polypeptide?

A) Glycine
B) Cysteine
C) Proline
D) None of the above

User RyanY
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1 Answer

2 votes

Step-by-step explanation:

I think the answer is D because their is no the form of covalent bond

User Nicko
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