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A : RNAi takes place in all eukaryotic o...

A : RNAi takes place in all eukaryotic organisms as a method of cellular defense.
R : Complementary dsRNA molecule binds to specific mRNA and prevents its translation (silencing).

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1 )

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements, then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that RNA interference (RNAi) occurs in all eukaryotic organisms as a method of cellular defense. - **Evaluation**: This statement is true. RNAi is a well-documented mechanism that serves as a defense against viruses and transposable elements in eukaryotic cells. 2. **Understanding the Reason (R)**: The reason provided states that a complementary double-stranded RNA (dsRNA) molecule binds to specific mRNA and prevents its translation (silencing). - **Evaluation**: This statement is also true. The process involves the binding of dsRNA to the target mRNA, which leads to the degradation of the mRNA or inhibition of its translation, effectively silencing the gene. 3. **Relationship Between Assertion and Reason**: Now, we need to determine if the reason justifies the assertion. - **Evaluation**: While both statements are true, the reason does not fully justify the assertion. The assertion speaks to the general occurrence of RNAi in all eukaryotes, while the reason describes a specific mechanism of action. Thus, the reason provides an example of how RNAi functions but does not explain why it is a defense mechanism in all eukaryotic organisms. 4. **Conclusion**: Both the assertion and reason are true, but the reason does not justify the assertion. Therefore, the correct answer is option B: both A and R are true, but R does not explain A.
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Assertion: RNAi involves silencing of a specific mRNA due to complementary RNA that bind to & prevents translation of the mRNA Reason :RNAi takes place in all prokaryotic organisms as a method of cellular defense