Which tRNA anticodons could decode the mRNA codon CAG recall

Which tRNA anticodon(s) could decode the mRNA codon CAG (recall that codons are always written in the 5\'—>3\' direction and anticodons are written in the 3\'—>5\' direction)? See Section 17.4 ( page 357) .

A. CUG or GUC

B. GUC only

C. CUG only

D. GUU or GUC

Solution

Answer

The mRNa is read in the 5\'-3\'direction, while anticodon is written in 3\'-5\'direction complemenrtary to the mRNA codons. The complementary anticodeons for 5\' CAG 3\' is 3\' GUC 5\'or 3\' GUU 5\' which codes for glutamie.