All are proteins except -

Options

A. Receptors + Insulin
B. Antibody + Trypsin
C. GLUT-4 +Collagen
D. CoQ

Answer

To solve the question "All are proteins except -", we need to analyze each option provided in the context of whether they are proteins or not.

### Step-by-step Solution:

1. **Identify the Options**: The question implies that there are several options given. We will evaluate each one to determine if it is a protein.

2. **Evaluate Each Option**:
- **Receptor**: Receptors are proteins that bind to specific ligands and play a crucial role in cellular communication. Therefore, receptors are proteins.
- **Insulin**: Insulin is a hormone made up of polypeptide chains (A, B, and C chains). It is indeed a protein hormone. Thus, insulin is a protein.
- **Antibody**: Antibodies are proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. Therefore, antibodies are proteins.
- **Trypsin**: Trypsin is an enzyme that helps in digestion and is classified as a protein. Hence, trypsin is a protein.
- **Glute 4**: Glute 4 is a transporter protein that facilitates glucose transport into cells. Thus, Glute 4 is a protein.
- **Collagen**: Collagen is the most abundant protein in the animal kingdom, providing structure and strength to tissues. Therefore, collagen is a protein.
- **Coenzyme Q**: Coenzyme Q, also known as ubiquinone, is a non-protein compound that acts as an electron carrier in the electron transport chain. It is not a protein.

3. **Conclusion**: After evaluating all the options, we find that the only non-protein among the options is **Coenzyme Q**.

### Final Answer:
The correct answer is **Coenzyme Q**.

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