The enormous diversity of protein molecules is manily due to diversity of

Options

A. Peptide bonds
B. R gorups on the amino acids
C. Amino gorups on the amino acids
D. Amino acid sequences within the protein molecules

Answer

To answer the question "The enormous diversity of protein molecules is mainly due to the diversity of:", we will analyze the options provided and determine which one correctly explains the source of protein diversity.

### Step-by-Step Solution:

1. **Understanding Protein Diversity**:
- Proteins are complex molecules that perform a variety of functions in living organisms. The diversity of proteins is crucial for various biological processes.

2. **Evaluating the Options**:
- **Option A: Peptide bonds**:
- Peptide bonds link amino acids together to form proteins. However, the nature of peptide bonds is consistent and does not contribute to the diversity of proteins. Therefore, this option is incorrect.

- **Option B: R groups on the amino acids**:
- There are 20 different amino acids, each with a unique R group. While the R groups do contribute to the properties of proteins, the limited number of amino acids (20) means that this alone does not account for the vast diversity of proteins. Thus, this option is also incorrect.

- **Option C: Amino groups on the amino acids**:
- The amino group (NH3+) is a common feature in amino acids. Most amino acids have a similar structure with a constant amino group, which does not contribute significantly to protein diversity. Therefore, this option is incorrect as well.

- **Option D: Amino acid sequence within the protein molecules**:
- The sequence of amino acids in a protein is highly variable. With 20 different amino acids that can be arranged in numerous combinations, the potential for different sequences is immense. This variability in the amino acid sequence is what leads to the enormous diversity of proteins. This option is correct.

3. **Conclusion**:
- The enormous diversity of protein molecules is mainly due to the diversity of the amino acid sequence within the protein molecules (Option D).

### Final Answer:
The enormous diversity of protein molecules is mainly due to the diversity of the **amino acid sequence within the protein molecules**.

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