A nucleic acid contains thymine or methylated uracil then it should be -

Options

A. DNA
B. RNA
C. Either DNA or RNA
D. RNA of bacteria

Answer

To determine the type of nucleic acid that contains thymine or methylated uracil, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components**:
- The question mentions two components: thymine and methylated uracil.

2. **Understand Thymine**:
- Thymine is a nitrogenous base that is classified as a pyrimidine. It is primarily found in DNA.

3. **Understand Methylated Uracil**:
- Methylated uracil is a modified form of uracil, which is also a pyrimidine. Methylated uracil can be referred to as thymine (5-methyluracil).

4. **Distinguish Between DNA and RNA**:
- DNA (deoxyribonucleic acid) contains thymine as one of its nitrogenous bases.
- RNA (ribonucleic acid) contains uracil instead of thymine.

5. **Conclusion**:
- Since the presence of thymine indicates that the nucleic acid is DNA, and methylated uracil is essentially thymine, we conclude that if a nucleic acid contains thymine or methylated uracil, it should be DNA.

### Final Answer:
The nucleic acid that contains thymine or methylated uracil should be **DNA**.

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