Question : (a) A DNA segment has a total of 1,500 nucleotides, out of which 410 are Guanine containing nucleotides. How many pyrimidine bases this segment possesses ? (b) Draw a diagrammatic sketch of a portion of DNA segment to support your

Question : (a) A DNA segment has a total of 1,500 nucleotides, out of

1.	Question : (a) A DNA segment has a total of 1,500 nucleotides, out of which 410 are Guanine containing nucleotides. How many pyrimidine bases this segment possesses ? (b) Draw a diagrammatic sketch of a portion of DNA segment to support your
Answer» Solution :Cytosine ·and thymine are PYRIMIDINES. ACCORDING ·to Chargaff's rule, the ratio of purism to pyrimidines is equal C = G Number of guanine-containing nucleotides = 410 `G=C=410rArr 410 +410 = 820` Number of adenine = Number of thymine A+T= Total number of nucleotids - nucleotides conrtaining G & C nitrogoenious =1500- 820 = 680 A= T = 340 Number of pyrimedines in segment = C+T= 410 + 340 = 750 (b) For diagrammatic Sketch : See Q . 1 (b) Set- I Delhi Board 2015