RNA contains which of the following base in place of Thymine of DNA-
(a) Thymine
(b) Uracil
(c) Adenine
(d) None of these

Options

A. Thymine
B. Uracil
C. Adenine
D. None of these

Answer

To solve the question "RNA contains which of the following bases in place of Thymine of DNA," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components of DNA and RNA**:
- DNA (Deoxyribonucleic Acid) contains four nitrogenous bases: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
- RNA (Ribonucleic Acid) also contains four nitrogenous bases, but it differs from DNA in one key aspect.

2. **Identify the Base that Replaces Thymine**:
- In DNA, Thymine (T) pairs with Adenine (A).
- In RNA, Thymine is replaced by Uracil (U). Therefore, Adenine in RNA pairs with Uracil instead of Thymine.

3. **Examine the Options Provided**:
- (a) Thymine: This is incorrect because RNA does not contain Thymine.
- (b) Uracil: This is correct as Uracil replaces Thymine in RNA.
- (c) Adenine: This is incorrect because Adenine does not replace Thymine; it pairs with Uracil.
- (d) None of these: This is incorrect because we have identified Uracil as the correct answer.

4. **Conclusion**:
- The correct answer is (b) Uracil, as it is the base that replaces Thymine in RNA.

### Final Answer:
(b) Uracil