Multiple choice

Initiation codon for methionine is

  1. AAA

  2. UUU

  3. UAA

  4. AUG

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

AUG is the universal start codon that codes for methionine and initiates protein synthesis in both prokaryotes and eukaryotes. UUU codes for phenylalanine, UAA is a stop codon, and AAA codes for lysine. The genetic code is nearly universal.