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Firstly, DNA is transcripted to mRNA, which is then translated by ribosomes into your polypeptide. Each set of 3 bases on the mRNA (codon) codes for a particular amino acid. However, there can be up to four codons, coding for a single amino acid. ie GCU, GCC, GCA and GCG all code for Alanine. Therefore, if you know the amino acid sequence, you can work backwards to mRNA and then to DNA, but you wouldn't be very accurate as you'd need to guess the codons.
mRNA carries the genetic code to a ribosome.
To transcribe DNA to messenger RNA, you need to replace each DNA base with its RNA complement: G in DNA is transcribed to C in mRNA, C to G, A to U (uracil), and T to A. Therefore, the DNA sequence ccg atc gac cga would be transcribed to GGC UAG CUG GCU in mRNA.
tRNA anticodon binds with mRNA codon during translation to ensure the correct amino acid is added to the growing polypeptide chain.
The next codon after GCU is GCC, which codes for the amino acid alanine.