There are 20 different types of amino acids that help in the formation of proteins. They differ from each other in the structure because of their

Options

A. Carboxyl group
B. Amine group
C. Functional group as R
D. Hydrogen’s orientation

Answer

To answer the question regarding the differences among the 20 different types of amino acids that help in the formation of proteins, we can follow these steps:

### Step-by-Step Solution:

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

2. **Common Structure**: All amino acids share the same basic structure:
- An amino group (-NH2)
- A carboxyl group (-COOH)
- A hydrogen atom
- A variable side chain (R group)

3. **Identifying the Differences**: The key to differentiating between the 20 amino acids lies in the R group. The R group can vary in size, shape, charge, and polarity, which leads to the unique properties of each amino acid.

4. **Conclusion**: Therefore, the differences among the 20 different types of amino acids are due to their R groups (functional groups). Each amino acid has a unique R group that determines its characteristics and role in protein structure and function.

### Final Answer:
The amino acids differ from each other in their structure because of their **R groups (functional groups)**.