Question

Initiation codon is

• A. $\text{UUU}$
• B. $\text{UGA}$
• C. $\text{AUG}$
• D. $\text{UAG}$

Answer 1

Answer: (C)

Initiation codon is $\text{AUG}$ which codes for methionine (Met), it is used as start signal in protein synthesis. It is the most common chain initiation codon. In prokaryotes, the codons $\text{GUG}$ and $\text{UUG}$ are also employed in instances as starts codons. Three triplets, $\text{UAA}$ (ochre), $\text{UAG}$ (amber) and $\text{UGA}$ (opal) do no code for an amino acid and are called non-sense codons or chain termination codons. $\text{UUU}$ (uracil) codes for phenylalanine,