Observe the table and answer the given question:

How many amino acids have only two codons coding for them each?

9

The correct answer is Option (4) → 9

The genetic code specifies the following amino acids that each have two codons:

1. Phenylalanine (Phe) - UUU, UUC
2. Tyrosine (Tyr) - UAU, UAC
3. Histidine (His) - CAU, CAC
4. Glutamine (Gln) - CAA, CAG
5. Asparagine (Asn) - AAU, AAC
6. Lysine (Lys) - AAA, AAG
7. Aspartic acid (Asp) - GAU, GAC
8. Glutamic acid (Glu) - GAA, GAG
9. Cysteine (Cys) - UGU, UGC

There are 9 amino acids that have exactly two codons coding for them.

          The Codons for the Various Amino Acids