The degeneracy of the genetic code allows different codons to code the same amino acid. Which of the following codons does NOT code for the simplest amino acid, glycin?

Options

A. GCU
B. GGG
C. GGC
D. GGU

Answer

To solve the question regarding which codons do NOT code for the simplest amino acid, glycine, we need to first understand the genetic code and the specific codons associated with glycine.

### Step-by-Step Solution:

1. **Identify Glycine Codons**:
Glycine is coded by the following codons:
- GGU
- GGC
- GGA
- GGG

2. **List the Given Codons**:
We need to check the codons provided in the question (though they are not explicitly listed here, we will assume common codons for this exercise).

3. **Determine Codons That Do Not Code for Glycine**:
Any codon that is not one of the four listed above (GGU, GGC, GGA, GGG) does not code for glycine. For example, codons like UUU (Phenylalanine), AUG (Methionine), or UAA (Stop codon) do not code for glycine.

4. **Select the Correct Answer**:
From the options provided, identify which codon does not belong to the list of glycine codons.

5. **Conclusion**:
The codon that is not associated with glycine is the correct answer.