Chapter 4: Q33. (page 96)
Draw the structure of the dipeptide β-alanylhistidine, also known as carnosine.
Short Answer
The structure of dipeptide carnosine is as shown.

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Chapter 4: Q33. (page 96)
Draw the structure of the dipeptide β-alanylhistidine, also known as carnosine.
The structure of dipeptide carnosine is as shown.

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Explain why an enzyme can catalyze a chemical reaction involving just one enantiomer of a compound.
List some covalent modifications of amino acids in proteins.
Identify all the chiral carbons in the amino acids shown in Table 4-1.
Determine the net charge of the predominant form of Asp at (a)pH 1.0, (b) pH 3.0, (c)pH 6.0, and (d) pH 11.0.
Over time, the glutamine residues of polypeptides are susceptible to deamidation, a reaction in which the amide group is replaced by a carboxylate group. What amino acid is produced when glutamine is deamidated?
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