Select the INCORRECT statement from the following .

Options

A. All biomolecules show turnover in cell.
B. There is no uncatalysed reaction in living system .
C. Metabolic pathways are either linear or circular
D. Living state is an equilibrium steady state to perform work .

Answer

To solve the question of identifying the INCORRECT statement among the given options, we will analyze each statement step by step.

1. **Statement 1: All biomolecules show turnover in cells.**
- **Analysis:** The term "turnover" refers to the process by which biomolecules are continuously broken down and replaced by new molecules. While many biomolecules do undergo turnover, it is not accurate to say that "all" biomolecules show turnover. Some biomolecules may remain stable for longer periods without undergoing significant turnover. Therefore, this statement is likely incorrect.

2. **Statement 2: There is no uncatalyzed reaction in living cells.**
- **Analysis:** In living cells, most reactions are catalyzed by enzymes to increase their rate. However, it is possible for some uncatalyzed reactions to occur, albeit at a much slower rate. Thus, this statement is generally considered correct as it emphasizes the predominance of catalyzed reactions in living systems.

3. **Statement 3: Metabolic pathways are either linear or circular.**
- **Analysis:** Metabolic pathways can indeed be categorized as linear (where the end product is formed through a series of reactions in a straight line) or circular (where the end product can re-enter the pathway, such as in the citric acid cycle). This statement is correct.

4. **Statement 4: Living state is an equilibrium steady state to perform work.**
- **Analysis:** Living systems maintain a steady state that is far from equilibrium, allowing them to perform work. This statement is correct as it reflects the dynamic nature of living organisms.

After analyzing all the statements, we conclude that:

- **Incorrect Statement:** Statement 1 is incorrect because not all biomolecules show turnover in cells.

### Summary of the Solution:
The INCORRECT statement is: "All biomolecules show turnover in cells."