Observe the table and answer the given question:
How many amino acids have only two codons coding for them each?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 9
From the table, the amino acids with only two codons are phenylalanine, tyrosine, histidine, glutamine, asparagine, lysine, aspartic acid, glutamic acid and cysteine: 9.
Option (4) 9 — Correct. In the genetic code, 9 amino acids have only two codons each: phenylalanine, tyrosine, histidine, glutamine, asparagine, lysine, aspartic acid, glutamic acid and cysteine.