Most of the biological activities of proteins are due to :

Options

A. Primary configuration
B. Secondary configuration
C. Tertiary configuration
D. More than one option is correct

Answer

To solve the question "Most of the biological activities of proteins are due to:", we can break it down into a few key steps:

### Step-by-Step Solution:

1. **Understanding Protein Structure**:
- Proteins are made up of amino acids and have different levels of structure: primary, secondary, tertiary, and quaternary.

2. **Identifying the Types of Protein Structures**:
- **Primary Structure**: This is the linear sequence of amino acids in a polypeptide chain.
- **Secondary Structure**: This refers to local folded structures that form within a protein due to hydrogen bonding, such as alpha helices and beta sheets.
- **Tertiary Structure**: This is the overall three-dimensional shape of a single polypeptide chain, which is crucial for the protein's functionality.
- **Quaternary Structure**: This involves the assembly of multiple polypeptide chains into a functional protein complex, such as hemoglobin.

3. **Relating Structure to Function**:
- The biological activities of proteins, such as enzyme activity, binding, and signaling, are primarily determined by their three-dimensional shape, which is defined by the tertiary structure.

4. **Conclusion**:
- Since the question asks about the biological activities of proteins, the correct answer is that most of these activities are due to the **tertiary structure** of proteins.

### Final Answer:
Most of the biological activities of proteins are due to their **tertiary structure**.

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