The newly synthesized protein molecule contains 120 amino acid residues. It is known that a portion of the transcribed DNA strand contained two introns (segments that do not carry genetic information related to protein synthesis) of 10 and 14 nucleotides, respectively. Before transcription, a mutation occurred in the DNA – a deletion of 6 nucleotides. How many nucleotides did the specified section of the DNA molecule contain? The presence of stop codons is not taken into account in the calculations
The protein molecule contains 120 amino acid residues. And one amino acid is encoded in DNA by three nucleotides (triplet), which means that 120 amino acids will be encoded by 360 nucleotides (120 * 3 = 360). Add 24 nucleotides of introns (10 + 14 = 24) and 6 nucleotides dropped out after mutation, it turns out that the total in the DNA chain was: 360 + 24 + 6 = 390 nucleotides.
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