Which of the following amino acids has hydrogen in its R group?
(a) Alanine
(b) Serine
(c) Glycine
(d) Cysteine

Options

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

Answer

To determine which amino acid has hydrogen in its R group, we will analyze each option provided in the question.

1. **Understanding the Basic Structure of Amino Acids**:
- All amino acids share a common structure, which includes a central carbon atom (C) bonded to four groups:
- An amino group (NH2)
- A carboxyl group (COOH)
- A hydrogen atom (H)
- An R group (side chain) that varies among different amino acids.

2. **Analyzing Each Option**:
- **(a) Alanine**:
- The R group of alanine is CH3 (methyl group). This does not contain hydrogen as the sole component; therefore, it does not meet the criteria.

- **(b) Serine**:
- The R group of serine is CH2OH (hydroxymethyl group). This also does not contain hydrogen as the sole component; hence, it is not the correct answer.

- **(c) Glycine**:
- The R group of glycine is simply H (hydrogen). This means glycine has hydrogen as its R group, making it the correct answer.

- **(d) Cysteine**:
- The R group of cysteine is CH2SH (thiol group). This does not contain hydrogen as the sole component; therefore, it is not the correct option.

3. **Conclusion**:
- After analyzing all the options, the only amino acid that has hydrogen in its R group is **glycine** (option C).

### Final Answer:
The amino acid that has hydrogen in its R group is **(c) Glycine**.