Which of the following statements about RNA is incorrect ?

Options

A. It has a single strand
B. It does not undergo replication
C. It doesnot contain any pyrimidine base
D. It controls the synthesis of proteins

Answer

To determine which statement about RNA is incorrect, let's analyze each option provided:

1. **RNA is single-stranded.**
- This statement is correct. RNA typically exists as a single strand, unlike DNA, which is double-stranded.

2. **RNA does not undergo replication.**
- This statement is also correct. RNA is synthesized from DNA during transcription and does not replicate itself like DNA does.

3. **RNA does not contain any pyrimidine base.**
- This statement is incorrect. RNA contains pyrimidine bases, specifically cytosine (C) and uracil (U). Therefore, this statement is false.

4. **RNA controls the synthesis of protein.**
- This statement is correct. RNA plays a crucial role in protein synthesis, particularly messenger RNA (mRNA), which carries the genetic information from DNA to the ribosome where proteins are synthesized.

**Conclusion:**
The incorrect statement about RNA is: "RNA does not contain any pyrimidine base."

### Step-by-Step Solution:
1. **Identify the statements about RNA.**
- Review each statement provided in the options.

2. **Evaluate the first statement:**
- RNA is single-stranded. This is true.

3. **Evaluate the second statement:**
- RNA does not undergo replication. This is also true.

4. **Evaluate the third statement:**
- RNA does not contain any pyrimidine base. This is false because RNA contains cytosine, which is a pyrimidine base.

5. **Evaluate the fourth statement:**
- RNA controls the synthesis of protein. This is true.

6. **Determine the incorrect statement:**
- The statement "RNA does not contain any pyrimidine base" is the incorrect one.