Select the correct Statement about about RNAi process .

Options

A. It involves silencing of a specific mRNA .
B. A cellular mechanisms that uses the gene's own DNA sequence to turn off mRNA expression .
C. It is a type of cellular defense.
D. All are correct

Answer

To solve the question regarding the correct statement about the RNA interference (RNAi) process, we will analyze each of the provided options step by step.

### Step 1: Understand RNA Interference (RNAi)
RNA interference is a biological process where RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. This process is crucial for regulating gene expression and defending against viral infections.

**Hint:** Remember that RNAi primarily involves the regulation of mRNA.

### Step 2: Analyze the Options
1. **Option 1: It involves silencing of a specific mRNA.**
- This statement is true. RNAi specifically targets and silences complementary mRNA sequences, preventing them from being translated into proteins.

**Hint:** Focus on the role of RNAi in targeting specific mRNA.

2. **Option 2: A cellular mechanism that uses gene's own DNA sequence to turn off mRNA expression.**
- This statement is also correct. RNAi can utilize sequences derived from the organism's own DNA to create double-stranded RNA that can bind to and silence mRNA.

**Hint:** Consider how RNAi can be derived from the organism's DNA.

3. **Option 3: It is a type of cellular defense.**
- This statement is true as well. RNAi serves as a defense mechanism against viruses and transposons in eukaryotic cells.

**Hint:** Think about the protective roles of RNAi in cells.

4. **Option 4: All are correct.**
- Since all the previous statements are correct, this option must also be correct.

**Hint:** If all individual statements are true, then the collective statement must also be true.

### Step 3: Conclusion
After analyzing all the options, we find that all statements about the RNA interference process are correct. Therefore, the correct answer is:

**Answer: D. All are correct.**