Every gene encode an enzyme that is required along the line to manufacture this amino acid: known as one gene-one enzyme. Slide 4: complete medium: giving all they need. If they can"t grow in the minimal medium then do their genes fail to specify the enzymes needed to produce the nutrient. Slide 5: the mutant you have to supplement for it to grow. The arg mutant require arginine to be present in the medium in order to grow. Slide 8: each gene encodes one polypeptide (simple building block of protein) Slide 11: francis crick (1956) came up with central dogma: dna-rna- protein. Transcription: dna is translated into a complementary rna. Translation: rna copy assemble amino acids into a polypeptide. Slide 12: transcription: the rna polymerase copies the dna sequence of a gene into an rna sequence. Slide 13: dna is made up of atgc.