In the following given options which one is mismatch?

Options

A. Oxygen - Most abundant element in human body as well as earth`s crust
B. Retentate - Macromolecule containing insoluble fraction
C. Proteins - Homopolymer
D. Carotenoids - Secondary metabolites

Answer

To solve the question of identifying the mismatch among the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Analyze the First Option: Oxygen as the Most Abundant Element**
- **Statement**: Oxygen is the most abundant element in the human body and the earth's crust.
- **Verification**:
- In the human body, oxygen constitutes about 65% of its mass.
- In the earth's crust, oxygen is also the most abundant element, making up about 46.6%.
- **Conclusion**: This statement is correct.

2. **Analyze the Second Option: Retentate as a Macromolecule Containing Insoluble Fractions**
- **Statement**: Retentate is a macromolecule containing insoluble fractions.
- **Verification**:
- When living tissue is treated with trichloroacetic acid and strained, the retentate consists of insoluble macromolecules such as proteins and carbohydrates.
- **Conclusion**: This statement is also correct.

3. **Analyze the Third Option: Protein as a Homopolymer**
- **Statement**: Protein is a homopolymer.
- **Verification**:
- Proteins are made up of different types of amino acids, making them heteropolymers.
- **Conclusion**: This statement is incorrect.

4. **Analyze the Fourth Option: Carotenoid as a Secondary Metabolite**
- **Statement**: Carotenoid is a secondary metabolite.
- **Verification**:
- Carotenoids are indeed classified as secondary metabolites, which are not directly involved in the normal growth, development, or reproduction of the organism but serve other functions like pigmentation.
- **Conclusion**: This statement is correct.

5. **Identify the Mismatch**
- Based on the analysis, the third option regarding proteins being homopolymers is the mismatch.
- Therefore, the answer is **Option C: Protein Homopolymer**.

### Final Answer:
The mismatch among the given options is **Option C: Protein Homopolymer**.