The unique properties of amino acid are determined by its particular:

Options

A. R group
B. amino group
C. kinds of peptide bonds
D. number of bonds to other amino acids

Explanation

To determine the unique properties of amino acids, we need to focus on the specific components that make each amino acid distinct. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Amino Acids**: Amino acids are the building blocks of proteins and are characterized by their basic structure, which includes an amino group (NH2), a carboxylic group (COOH), a hydrogen atom, and a variable side chain known as the R group.

2. **Identifying the Components**: The common components of all amino acids are the amino group, carboxylic group, and the hydrogen atom. However, the unique properties of each amino acid arise from the R group.

3. **Role of the R Group**: The R group, or side chain, is what differentiates one amino acid from another. There are 20 standard amino acids, and each has a unique R group that can vary in size, shape, charge, and polarity.

4. **Classification Based on R Group**: The differences in the R groups allow us to classify amino acids into different categories, such as:
- **Acidic Amino Acids**: Contain R groups that are acidic.
- **Basic Amino Acids**: Contain R groups that are basic.
- **Neutral Amino Acids**: Contain R groups that are neither acidic nor basic.

5. **Conclusion**: Therefore, the unique properties of amino acids are determined by their particular R group. The amino group, types of peptide bonds, and the number of bonds do not influence the unique characteristics of the amino acids.

### Final Answer:
The unique properties of amino acids are determined by their particular R group.

---