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Q.

A fragment of DNA has 480 nucleotides out of which 110 are those of adenine. The number of cytosine nucleotides is

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a

220

b

110

c

130

d

240

answer is B.

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Detailed Solution

Total number of nucleotides – 480

110 adenines = 110 thymine (A complementary to T)

480 – 220 = 260 are (C + G)

As C & G are egucl in number, C complementary

C + G = 260

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