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Q.

The number of nucleosomes present approximately in a typical mammalian cell is

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a

3.3 x 104

b

3.3 x 103

c

3.3 x 1010

d

3.3 x 107

answer is C.

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Detailed Solution

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A typical nucleosome contains 200 bp of DNA helix. The total number of base pairs in a diploid mammalian cell is = 6.6 x109 bp. The number of nucleosomes present in the mammalian cell is

Number of nucleosomes = Total number of base pairs /Number of base pairs per nucleosome

= 6.6 x 109/200 = 3.3 x 107 nucleosomes

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