What are those structures that appear as 'beads-on-string' in the chromosomes, when viewed under electron microscope?

Base pairs

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Genes

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Nucleotides

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Nucleosomes

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Solution

The correct option is D Nucleosomes
DNA molecule is wound around histone core to form nucleosomes. The nucleosomes actually represent the beads of beads-on-string structure visible under electron microscope.
So, the correct answer is 'Nucleosomes'

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What are the structures called that give an appearance as ‘beads on a string’ in the chromosomes when viewed under an electron microscope?

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