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Biomolecules question

2016 · Shift 0 · Q14
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Biomolecules question

2016 · Shift 0 · Q14

JEE MainChemistryBiomoleculesMCQ+4 / −1
Thiol group is present in :
  1. A
    Cytosine
  2. B
    Cystine
  3. C
    Cysteine
  4. D
    Methionine
View written solutionFree

Correct answer: C

  1. Identify the functional group asked in the question

    The thiol group is: −SH-SH−SH It is also called the sulfhydryl group.

  2. Check each option

    A: Cytosine
    Cytosine is a nitrogenous base. It does not contain a thiol group.

    B: Cystine
    Cystine is formed by oxidation of two cysteine molecules. Its sulfur is present as a disulfide bond: −S−S−-S-S-−S−S− So it does not contain a free thiol group.

    C: Cysteine
    Cysteine is an amino acid with side chain: −CH2−SH-CH_2-SH−CH2​−SH Hence, it contains a thiol group.

    D: Methionine
    Methionine contains sulfur in a thioether group: −S−-S-−S− not as a thiol (−SH)(-SH)(−SH).

  3. Conclusion

    The compound containing the thiol group is: Cysteine\boxed{\text{Cysteine}}Cysteine​

  4. Comparison with stored correct answer

    Stored correct answer: C
    Derived answer: C
    They match.

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