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In glycine the R group is replaced by -...

In glycine the R group is replaced by -

A

A methyl group

B

Hydroxy methyl

C

A carboxylic group

D

A hydrogen

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The correct Answer is:
### 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 (Cα) connected to four different groups: an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (H), and a variable R group (side chain). 2. **Identifying Glycine**: Glycine is the simplest amino acid. Its structure is unique because its R group is not a complex side chain but rather a single hydrogen atom. 3. **Analyzing the R Group**: In glycine, the R group is replaced by a hydrogen atom. This means that the structure of glycine can be represented as: - Central Carbon (Cα) - Amino Group (-NH2) - Carboxyl Group (-COOH) - Hydrogen (H) as the R group. 4. **Conclusion**: Therefore, in glycine, the R group is replaced by a hydrogen atom. ### Final Answer: In glycine, the R group is replaced by a hydrogen atom. ---
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