what is the complimentary mRNA strand to the DNA strand GCGTAT?

a) CGCAUA - RNA does not have thymine, it transcribe T as U. [trascribtion process]
b) GGAUUC - this is translation process, tRNA matches the bases with mRNA, so ribosomes can produce the specific amino acid.

The complimentary mRNA strand to GCGTAT, is CGCAUA
The complimentary tRNA strand to CCTAAG, is GGAUUC

Both tRNA and mRNA, is involved in the expression of genes to produce proteins. mRNA is used in transcription, where it is produced as a complete opposite of the codes(GCGTAT) of the DNA to (CGCAUA). The mRNA is then moved to the cytoplasm where translation takes place. tRNA is used here where it translates the mRNA to produce a protein. The main difference between tRNA and mRNA is that, tRNA strand has the same codes like the DNA, but has U instead of T. mRNA is a complete opposite to the DNA strand (complimentary), with Uracil (U) replacing T(Thymine).