How many nucleosomes can be formed approximately if an organism's genome has a double-stranded DNA of length 1.0 × 10⁴ bp?

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0.5 × 10²

1.2 × 10³

1.0 × 10³

0.5 × 10⁴

answer is B.

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Detailed Solution

The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called a nucleosome. The packing of DNA into nucleosomes is found only in eukaryotes.

DNA of 200 bp forms one nucleosome. If the total length of DNA is 10000bp, then the number of nucleosomes to be formed is 10000/200 = 50.

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