If a codon on mRNA is GGG, what is the anticodon on tRNA that pairs with it?

If a codon on mRNA is GGG, what is the anticodon on tRNA that pairs with it?

• A. GGG
• B. CCC
• C. GCC
• D. UUU

Answer: (B)

In translation, the tRNA anticodon must be complementary and antiparallel to the mRNA codon. In RNA, G pairs with C and A pairs with U. So for the codon GGG, the anticodon must provide C for each position, arranged antiparallel to the codon. That gives CCC (written 3' to 5'). Other sequences wouldn’t form proper base pairing with GGG (for example, UUU pairs with AAA).

In translation, the tRNA anticodon must be complementary and antiparallel to the mRNA codon. In RNA, G pairs with C and A pairs with U. So for the codon GGG, the anticodon must provide C for each position, arranged antiparallel to the codon. That gives CCC (written 3' to 5'). Other sequences wouldn’t form proper base pairing with GGG (for example, UUU pairs with AAA).