Which of the following amino acids has hydrogen in its R group?

Options

A. Alanine
B. Serine
C. Glycin
D. Cysteline

Answer

To determine which amino acid has hydrogen in its R group, we need to analyze the structure of common amino acids and identify their R groups.

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
- Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has a central carbon atom (C) bonded to four groups: an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (H), and an R group (side chain) that varies among different amino acids.

2. **Identifying Amino Acids with Hydrogen in R Group**:
- The R group can be a variety of structures, including simple atoms or complex chains. We are specifically looking for an amino acid where the R group is just a hydrogen atom (H).

3. **Recognizing Glycine**:
- Glycine is the simplest amino acid and has the chemical structure NH2-CH2-COOH. In this case, the R group is -H (hydrogen). Therefore, glycine is the only amino acid with hydrogen as its R group.

4. **Conclusion**:
- The amino acid that has hydrogen in its R group is **Glycine**.