The five elements that comprise most proteins are -

Options

A. C,S,O,P,K
B. C, H, O, N, S
C. C, H, N, S, P
D. C, H, O, N, Fe

Answer

To answer the question regarding the five elements that comprise most proteins, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protein Composition**: Proteins are large biomolecules made up of smaller units called amino acids. Each amino acid contains specific functional groups that contribute to the overall structure of proteins.

2. **Identifying Key Groups**: The two main functional groups found in amino acids are:
- **Amine Group (NH2)**: This group contains nitrogen and hydrogen.
- **Carboxyl Group (COOH)**: This group contains carbon, oxygen, and hydrogen.

3. **Listing the Elements**: From the functional groups identified, we can extract the elements involved:
- **Nitrogen (N)**: Present in the amine group.
- **Hydrogen (H)**: Present in both the amine and carboxyl groups.
- **Carbon (C)**: Present in both the amino acid backbone and the carboxyl group.
- **Oxygen (O)**: Present in the carboxyl group.
- **Sulfur (S)**: Although not present in all amino acids, sulfur is found in some essential amino acids like methionine and cysteine.

4. **Conclusion**: Therefore, the five elements that comprise most proteins are:
- **Carbon (C)**
- **Hydrogen (H)**
- **Oxygen (O)**
- **Nitrogen (N)**
- **Sulfur (S)**

### Final Answer:
The five elements that comprise most proteins are Carbon, Hydrogen, Oxygen, Nitrogen, and Sulfur.

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