Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements:
(1) In the tripeptide Gly-Ala-Ser, the amino acid at the N-terminal end is Ser.
(2) More than one polypeptide chain may be present in a conjugated protein but not in a simple protein.
(3) In solution at physiological pH, the side chain of a polar basic amino acid bears a negative charge.

Question

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: 
(1) In the tripeptide Gly-Ala-Ser, the amino acid at the N-terminal end is Ser.
(2) More than one polypeptide chain may be present in a conjugated protein but not in a simple protein.
(3) In solution at physiological pH, the side chain of a polar basic amino acid bears a negative charge.

Quizplus · Accepted Answer

- Statement 1 is false because in the tripeptide Gly-Ala-Ser, Gly (Glycine) is at the N-terminal end, not Ser (Serine).- Statement 2 is false because both conjugated and simple proteins can have more than one polypeptide chain; the distinction lies in the presence (conjugated) or absence (simple) of a non-protein component.- Statement 3 is false because the side chain of a polar basic amino acid (like lysine, arginine, or histidine) bears a positive charge at physiological pH, not a negative charge.

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