Select the incorrect statement

Options

A. Ribozymes are nucleic acids with catalytic power
B. Nucleic acids serve as genetic material
C. Proteins, nucleic acids and polysaccharides are the only three types of macromolecules found in the living system
D. Collagen is the most abdundant protein in the whole of the biosphere and RuBisCo is the most abundant protein in animal world

Answer

To solve the question of selecting the incorrect statement, we will analyze each option provided:

1. **Option A**: "Ribozymes are nucleic acids with catalytic power."
- This statement is correct. Ribozymes are indeed RNA molecules that can catalyze biochemical reactions, similar to protein enzymes. They play a crucial role in processes such as protein synthesis.

2. **Option B**: "Nucleic acids serve as genetic material."
- This statement is also correct. Both DNA and RNA are nucleic acids that serve as genetic material in living organisms. DNA stores genetic information, while RNA plays roles in translating that information into proteins.

3. **Option C**: "Proteins, nucleic acids, and polysaccharides are the only three types of macromolecules found in the living system."
- This statement is correct as well. Proteins, nucleic acids (DNA and RNA), and polysaccharides (like starch and cellulose) are indeed the three main types of macromolecules that are essential to life.

4. **Option D**: "Collagen is the most abundant protein in the whole of the biosphere."
- This statement is incorrect. While collagen is the most abundant protein in the animal kingdom, it is not the most abundant protein in the entire biosphere. The protein Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is considered the most abundant protein in the biosphere, as it plays a critical role in the process of photosynthesis.

**Conclusion**: The incorrect statement is **Option D**.