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Thiol group is present in:

1. Cysteine
2. Methionine
3. Cytosine
4. Cystine

Correct answer: Cysteine

Solution

The thiol (-SH) group is found in cysteine. Methionine contains a thioether (-S-CH3), and cystine has a disulfide (-S-S-) linkage. Answer: option 0.

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