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How many nucleosomes are present in a mammalian cell?(a) 20 million(b) 30 million(c) 40 million(d) 10 millionThis question was addressed to me in examination.My doubt stems from Packaging of DNA Helix in division Molecular Basis of Inheritance of Biology – Class 12

Answer»

Right choice is (b) 30 million

To explain I would say: The diploid cell of a eukaryotic MAMMAL contains 6.4 x 10^9 nucleotides. A single cell of such type will 30 million nucleosomes in it. Nucleosomes containing chromatin when viewed under an electron microscope appear to be LIKE “Beads-on-string”.



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