what is the R group in glycine?

Options

A. `CH_(2)-OH`
B. H
C. `CH_(3)`
D. none of them

Answer

To determine the R group in glycine, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Amino Acids**:
- Amino acids consist of a central carbon atom (alpha carbon) bonded to four different groups: an amino group (-NH2), a carboxylic acid group (-COOH), a hydrogen atom, and an R group (side chain).

2. **Identify Glycine**:
- Glycine is the simplest amino acid and is classified as an alpha amino acid. In glycine, the R group is unique compared to other amino acids.

3. **Determine the R Group in Glycine**:
- In glycine, the R group is a hydrogen atom (H). This means that glycine has the following structure:
- Amino group: -NH2
- Carboxylic group: -COOH
- R group: H

4. **Compare with Other Amino Acids**:
- To confirm that the R group in glycine is indeed hydrogen, we can compare it with other amino acids:
- For example, if the R group were CH2OH, it would correspond to serine, and if it were a methyl group (CH3), it would correspond to alanine.

5. **Conclusion**:
- Since the R group in glycine is hydrogen, we can conclude that the answer to the question is that the R group in glycine is H.

### Final Answer:
The R group in glycine is Hydrogen (H).

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