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(a) A DNA segment has a total of 1,500 n...

(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?

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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=410 rArr 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
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