Chapter 29: 16P (page 1166)
How many different tripeptides can be formed from three different amino acids?
Short Answer
Two different tripeptides can be formed from three different amino acids.
Chapter 29: 16P (page 1166)
How many different tripeptides can be formed from three different amino acids?
Two different tripeptides can be formed from three different amino acids.
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Get started for freeHistidine is classified as a basic amino acid because one of the N atoms in its five-membered ring is readily protonated by acid. Which N atom in histidine is protonated and why?
Draw the amino acids and peptide fragments formed when the decapeptide A-P-F-L-K-W-S-G-R-G is treated with each reagent or enzyme: (a) chymotrypsin; (b) trypsin; (c) carboxypeptidase; (d)
a.(S)-Penicillamine, an amino acid that does not occur in proteins, is used as a copper chelating agent to treat Wilson’s disease, an inherited defect in copper metabolism.
(R)-Penicillamine is toxic, sometimes causing blindness. Draw the structures of (R) and (S)-penicillamine.
b. What disulfide is formed from oxidation of L-penicillamine?
Draw the products of each reaction.
(a)
(b)
(c)
(d)
What form exists at the isoelectric point of each of the following amino acids: (a) valine; (b)leucine; (c)proline; (d) glutamic acid
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