The gene contains 1,500 nucleotides. One of the chains contains 150 nucleotides A, 200 nucleotides T, 250 nucleotides G and 150 nucleotides C. How many nucleotides of each species will be in the DNA chain encoding a protein? How many amino acids will be encoded by this DNA fragment?
1) In accordance with the nucleotide complementarity rule, the DNA coding chain will contain: nucleotide T – 150, nucleotide A – 200, nucleotide C – 250, nucleotide G – 150. Thus, total A and T are 350 nucleotides each, G and C each 400 nucleotides.
2) A protein is encoded by one of the DNA strands.
3) Since in each of the chains 1500/2 = 750 nucleotides, in it 750/3 = 250 triplets. Therefore, this DNA region encodes 250 amino acids.
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