Question

Which one of the following amino acids contributes to the sulfur content in a protein?

• A. Methionine
• B. Proline
• C. Leucine
• D. Phenylalanine

Hint:

• Sulfur amino acids → Methionine, Cysteine
• Important for disulfide bonds (Cysteine)

Answer 1

The Correct Option is A

Concept: Some amino acids contain sulfur in their structure:
• Methionine and Cysteine are sulfur-containing amino acids.

Step 1: Analyzing each option.

• Methionine: Contains sulfur in its side chain → Correct.
• Proline: Does not contain sulfur → Incorrect.
• Leucine: Nonpolar amino acid without sulfur → Incorrect.
• Phenylalanine: Aromatic amino acid without sulfur → Incorrect.

Step 2: Selecting the correct answer.
Only methionine contributes to sulfur content among the given options.