Differences in amino acids are due to their

Options

A. Carboxyl group
B. Amino group
C. Peptide bond
D. R-Group.

Answer

To answer the question "Differences in amino acids are due to their", we will analyze the components of amino acids and identify which part contributes to their differences.

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
- Amino acids are the building blocks of proteins. Each amino acid has a basic structure that includes an amino group (-NH2), a carboxyl group (-COOH), and a hydrogen atom, along with a unique side chain known as the R group.

2. **Identifying Common Components**:
- All amino acids share the same basic components: the amino group and the carboxyl group. These groups are essential for the formation of peptide bonds, which link amino acids together to form proteins.

3. **Focusing on the R Group**:
- The only part of the amino acid structure that varies among different amino acids is the R group (side chain). This R group can be a simple hydrogen atom, a carbon chain, or even a complex ring structure, and it determines the unique properties of each amino acid.

4. **Conclusion**:
- Since the differences in amino acids arise from the variations in their R groups, we conclude that the correct answer to the question is the R group.

### Final Answer:
The differences in amino acids are due to their **R group**.

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