The first amino acids taking part in protein synthesis is .

Options

A. Met
B. Val
C. Arg
D. Tryp

Answer

### Step-by-Step Solution:

1. **Understanding Protein Synthesis**: Protein synthesis is the process by which cells generate proteins based on the genetic information encoded in mRNA. It involves several steps, including initiation, elongation, and termination.

2. **Identifying the First Amino Acid**: The first amino acid that takes part in protein synthesis is methionine. This is a universal starting point for protein synthesis in eukaryotic organisms.

3. **Role of Codons**: Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids. In the context of protein synthesis, the codon that initiates the process is crucial.

4. **The Initiation Codon**: The codon that specifies methionine is AUG. This codon is recognized by the ribosome as the start signal for translation.

5. **Ribosomal Binding**: The process begins with the binding of ribosomal subunits and initiation factors to the mRNA. The initiator tRNA, which carries methionine, binds to the AUG codon.

6. **Translation Initiation**: Upon recognition of the AUG codon, the translation process starts, and methionine is the first amino acid to be incorporated into the growing polypeptide chain.

### Final Answer:
The first amino acid taking part in protein synthesis is methionine (Met), specified by the codon AUG.

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