Polypeptide chain in eukaryotes is initiated by codons coding for amino acid

Options

A. glycine
B. leucine.
C. methionine
D. lysine

Answer

To solve the question regarding the initiation of the polypeptide chain in eukaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which amino acid is coded by the initiation codon in eukaryotes during the formation of a polypeptide chain.

2. **Identifying the Start Codon**: In eukaryotes, the polypeptide chain synthesis begins with a specific codon known as the start codon. The most common start codon is AUG.

3. **Codon and Amino Acid Relationship**: The start codon AUG codes for the amino acid methionine. This means that when the ribosome reads the AUG codon, it will incorporate methionine as the first amino acid in the polypeptide chain.

4. **Other Start Codons**: While AUG is the most common start codon, there are other codons such as GUG and UUG that can also serve as start codons in some cases. However, even when these codons are used, they typically lead to the incorporation of methionine.

5. **Conclusion**: Therefore, the polypeptide chain in eukaryotes is initiated by codons coding for the amino acid methionine.

### Final Answer:
The polypeptide chain in eukaryotes is initiated by codons coding for the amino acid **methionine**.

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