The structures that appear as 'beads on string' in the chromosomes when viewed under electron microscope are

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 A Nucleosomes
A nucleosome is a basic unit of DNA packaging in eukaryotes, consisting of a segment of DNA wound in sequence around eight histone protein cores. This structure is often compared to thread wrapped around a spool.

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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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