Urwa Mesret 3.5 Bio notesTranscription is where the gene is converted into a mRNAmessenger which is posted to the ribosomes which occurs innucleus.Translation occurs when ribosomes translate the message intoa polypeptide which occurs in the cytoplasm. The sequence of amino acids is determined by the genes which are codes for making polypeptide.DNA – double helix & Thymine pairs with AdenineRNA- single strand & bases Uracil replaces ThymineTranscription is where a polymerase makes a mRNA moleculethat is complementary to the DNA.Translation is where mRNA is posted out of the nucleus and attaches to ribosomes. Ribsomes use complementary base-pairing to ‘read’ codons on the mRNA. tRNA transfer molecules with corresponding anti- codons bring the correct amino acid. DNA is transcribed in triplets- sequence of three bases which gives mRNA codons- sequence of three RNA bases. mRNA codons make up genetic code. The genetic code: all living things use the same code and same bases. Codons code for the same amino acids. There are 64 codons but 20 amino acids.