Which of the following statement are incorrect ?
(i)RNA act as a genetic material as well as a catalyst.
(ii)RNA is more stable than DNA
(iii)RNA has evolved from DNA

Options

A. (i) and (iii) only
B. (ii) and (iii) only
C. (i), (ii) and (iii)
D. (i) and (ii) only

Explanation

To determine which of the statements are incorrect, we will analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement:** RNA acts as a genetic material as well as a catalyst.

**Explanation:** This statement is correct. RNA can serve as genetic material in some viruses (like retroviruses) and also has catalytic properties (as seen in ribozymes). Therefore, this statement is not incorrect.

### Step 2: Analyze Statement (ii)
**Statement:** RNA is more stable than DNA.

**Explanation:** This statement is incorrect. RNA is generally less stable than DNA due to its single-stranded structure and the presence of the hydroxyl group (-OH) on the ribose sugar, which makes it more reactive and prone to hydrolysis. DNA, being double-stranded and lacking the hydroxyl group, is more chemically stable.

### Step 3: Analyze Statement (iii)
**Statement:** RNA has evolved from DNA.

**Explanation:** This statement is also incorrect. The prevailing hypothesis in molecular biology is that DNA evolved from RNA, not the other way around. RNA is thought to have been the first genetic material in early life forms, and DNA evolved later as a more stable means of storing genetic information.

### Conclusion:
Based on the analysis:
- Statement (i) is correct.
- Statement (ii) is incorrect.
- Statement (iii) is incorrect.

Thus, the incorrect statements are (ii) and (iii).

### Final Answer:
The incorrect statements are: (ii) RNA is more stable than DNA and (iii) RNA has evolved from DNA.

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