The eukaryotic gene encoding protein A includes five exons (140 base pairs) and three introns (720 base pairs). Determine the content of nucleotides in immature pro-i-NK and in mature m-RNA.
Exons carry information about protein structure. Introns are non-coding regions.
1. Immature pro-i-RNA contains all information rewritten from a given DNA region, ie. with five exons and three introns. Therefore, the number of nucleotides in immature pro-i-RNA is: 5 x 140 +3 x 720 = 2860 nucleotides.
2. When pro-i-RNA matures, introns are excised from it, therefore, mature pro-i-RNA will consist of only 5 exons, which means that the number of nucleotides in mature pro-i-RNA is 5 x 140 = 700 nucleotides.
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