Thymine differs fro uracil in having

Options

A. `CH_(3)` group
B. `C=O` group
C. `CHO` group
D. COOH group

Answer

**Step-by-Step Solution:**

1. **Identify the Compounds**: Understand that thymine and uracil are both nitrogenous bases that are part of nucleic acids. Thymine is found in DNA, while uracil is found in RNA.

2. **Classify the Nitrogenous Bases**: Recognize that both thymine and uracil belong to the category of pyrimidines, which also includes cytosine.

3. **Examine Their Structures**: Analyze the structural differences between thymine and uracil. Both have a similar hexagonal structure, but there is a key difference.

4. **Identify the Functional Group**: Note that thymine has a methyl group (CH3) attached to its structure, while uracil does not have this methyl group.

5. **Conclude the Difference**: Based on the structural analysis, conclude that thymine differs from uracil in having a methyl group (CH3).

**Final Answer**: Thymine differs from uracil in having a methyl group (CH3).

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