Find out wrong one.

Options

A. Fevicol is a synthetic resin (polyvinyl alcohol)
B. Biurets test, solubility test/Grease test and Ninhydrin test are done for protein, fat (oil) and AAs respectively
C. Gums are heteropolysaccharide.
D. Low Km value indicates lower susbtrate affinity.

Answer

To solve the question "Find out the wrong one," we need to analyze each option provided in the context of biomolecules, specifically focusing on the statements related to them.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided include:
- Fabricol is a synthetic resin that is polyvinyl alcohol.
- Burettes, Solidity Test, or Grease Test for fats, oil, and NIN Hydrin Test for amino acids.
- Gums are heteropolysaccharides.
- Low Km value indicates lower substrate affinity.

2. **Evaluate Each Statement**:
- **Fabricol**: This statement is correct as Fabricol is indeed a synthetic resin made from polyvinyl alcohol.
- **Burettes and Tests**: The statement regarding Burettes and the tests for proteins and fats is also correct. Burettes are used for titration, and the tests mentioned are standard tests for identifying proteins and fats.
- **Gums**: The statement that gums are heteropolysaccharides is correct. Gums are indeed classified as heteropolysaccharides.
- **Km Value**: The statement "Low Km value indicates lower substrate affinity" is incorrect. In enzyme kinetics, a low Km value indicates a higher affinity of the enzyme for its substrate. Therefore, this statement is wrong.

3. **Conclusion**: The incorrect statement is the one regarding the Km value. The correct interpretation is that a low Km value indicates a higher substrate affinity, not lower.

### Final Answer:
The wrong statement is: "Low Km value indicates lower substrate affinity."

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