Which of the following statement about `RNA` is not correct ?

Options

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

Answer

To determine which statement about RNA is not correct, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding RNA**:
- RNA stands for ribonucleic acid. It is a crucial biomolecule involved in various biological roles, particularly in coding, decoding, regulation, and expression of genes.

2. **Evaluating the First Statement**:
- The first statement claims that RNA has a single strand.
- **Analysis**: This statement is correct. RNA is typically single-stranded, unlike DNA, which is double-stranded.

3. **Evaluating the Second Statement**:
- The second statement states that RNA does not undergo replication.
- **Analysis**: This statement is also correct. RNA does not replicate itself; replication is a process associated with DNA.

4. **Evaluating the Third Statement**:
- The third statement claims that RNA does not contain any pyrimidine bases.
- **Analysis**: This statement is incorrect. RNA contains pyrimidine bases, specifically cytosine and uracil. Therefore, this statement is not correct.

5. **Evaluating the Fourth Statement**:
- The fourth statement says that RNA controls the synthesis of proteins.
- **Analysis**: This statement is correct. RNA plays a key role in protein synthesis, with mRNA carrying the genetic information from DNA to ribosomes, where proteins are synthesized.

6. **Conclusion**:
- The statement that RNA does not contain any pyrimidine bases is the incorrect statement about RNA.

### Final Answer:
The statement about RNA that is not correct is: "RNA does not contain any pyrimidine bases."