Assertion :- Removal of introns is must for transcription of hnRNA to mRNA.
Reason : In bacteria introns are not present.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

To solve the question, we need to evaluate both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that the removal of introns is essential for the transcription of hnRNA to mRNA.

- **Explanation**: Heterogeneous nuclear RNA (hnRNA) is the primary transcript that contains both introns (non-coding regions) and exons (coding regions). Before hnRNA can be translated into a protein, it must undergo processing, which includes the removal of introns. This process is known as splicing, and it results in the formation of mature mRNA that only contains exons.

### Step 2: Understand the Reason
The reason states that in bacteria, introns are not present.

- **Explanation**: Bacteria (prokaryotes) typically do not have introns in their genes. Their genes are usually organized in a way that allows for direct transcription of mRNA from DNA without the need for splicing. In contrast, eukaryotic genes often contain introns that must be removed during the processing of hnRNA to mRNA.

### Step 3: Evaluate the Truth of Each Statement
- The assertion is **true** because intron removal is indeed necessary for the conversion of hnRNA to mRNA in eukaryotes.
- The reason is **false** because it incorrectly states that bacteria do not have introns; while it is true that most bacterial genes do not contain introns, some exceptions exist, and the generalization is misleading.

### Conclusion
- The assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true, and the reason is false.

### Final Answer
**Assertion is true; Reason is false.**

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