Select an incorrect statement

Options

A. RNA was the first genetic material
B. Essential life processes evolved around DNA
C. RNA used to act as a genetic material as well as a catalyst in the past
D. Some biochemical reactions in living systems are catalysed by RNA catalysts

Answer

To solve the question "Select an incorrect statement," we will analyze each statement provided in the options and determine which one is incorrect.

### Step-by-Step Solution:

1. **Analyze Statement A**: "RNA was the first genetic material."
- This statement is correct. It is widely accepted in molecular biology that RNA was likely the first genetic material before DNA evolved. Early life forms are believed to have utilized RNA for both genetic information and catalysis.

2. **Analyze Statement B**: "Essential life processes evolved around DNA."
- This statement is incorrect. Essential life processes are thought to have evolved around RNA, not DNA. Before DNA existed, RNA was the primary molecule involved in these processes, including replication and catalysis.

3. **Analyze Statement C**: "RNA used to act as a genetic material as well as a catalyst in the past."
- This statement is correct. RNA can function as both genetic material and a catalyst (as seen in ribozymes). This dual role supports the RNA world hypothesis.

4. **Analyze Statement D**: "Some biochemical reactions in living systems are catalyzed by RNA catalysts."
- This statement is also correct. RNA molecules, particularly ribozymes, can catalyze various biochemical reactions, demonstrating that RNA still plays a catalytic role in modern biology.

### Conclusion:
After analyzing all the statements, the incorrect statement is **Statement B**: "Essential life processes evolved around DNA."