Consider the following statements
a) A component of the nucleotide sequence that makes up the prokaryotic promoter is CAAT box
b) A component of the nucleotide sequence that makes up the eukaryotic promoter is TATA box.
Which of the statements given above is/are correct?

Options

A. a only
B. b only
C. Both a and b
D. Neither a nor b

Answer

To solve the question regarding the correctness of the statements about prokaryotic and eukaryotic promoters, let's analyze each statement step by step.

### Step 1: Analyze Statement A
**Statement A:** "A component of the nucleotide sequence that makes up the prokaryotic promoter is CAAT box."

- The CAAT box is a conserved sequence of nucleotides that is typically found in eukaryotic promoters, not prokaryotic promoters. It is located about 75 to 80 base pairs upstream of the transcription initiation site in eukaryotes.
- In prokaryotes, the promoter regions do not contain a CAAT box. Therefore, this statement is **incorrect**.

### Step 2: Analyze Statement B
**Statement B:** "A component of the nucleotide sequence that makes up the eukaryotic promoter is TATA box."

- The TATA box is indeed a component of the eukaryotic promoter. It is a sequence of DNA found in the core promoter region of a gene in eukaryotic cells.
- The TATA box is recognized by the RNA polymerase enzyme and plays a crucial role in determining the start point of transcription.
- However, it is important to note that the TATA box is not found in prokaryotic cells. Therefore, while this statement is true regarding its presence in eukaryotic promoters, it is misleading as it suggests a broader applicability.

### Conclusion
Based on the analysis:
- **Statement A** is incorrect.
- **Statement B** is correct regarding eukaryotic promoters but is misleading as it implies a broader context.

Thus, the final answer is that **only Statement B is correct** regarding eukaryotic promoters.

### Final Answer:
- **Correct Statements:** Only Statement B is correct.