Complementary angles add up to 90 degrees

Answer and Explanation: For the sequence 5′-GATTACA-3′, the complementary DNA strand would be 3′-CTAATGT-5′. Often, DNA strands are written in the 5′ to 3′ direction, so the complementary strand would be 5′-TGTAATC-3′ when written 5′ to 3′. What is complementary to mRNA?

Anticodon

anti-codon.

it depends on the codon spcified. The tRNA will have the complementary strand along with an amino acid, for which is specified by the mRNA. if the mRNA codon was "CGA" the tRNA codon would have an amino acid and the complementary codon of "GCU"