Question

If a tRNA molecule has a anticodon which reads GCU, what was the codon of the mRNA molecule

Answer 1

So it would be the complimentary base pairing of the anticodon, making the mRNA codon:
CGA

Answer 2

Answer: The codon of the mRNA molecule is CGA.

tRNA ( transfer RNA) molecule carries a sequence of three bases in its anticodon loop, which are complementary to the mRNA ( messenger RNA) codon. mRNA codon codes for a particular amino acid like CGA in this case codes for Arginne ( R), which is carried by the tRNA molecule in its amino acid attachment site.

When anticodon matches with the codon in the mRNA, amino acids are assembled in a particular order, which is dictated by the codon of mRNA.

Thus, the codon of mRNA for the anticodon GCU is CGA