The structures that appear as 'beads on string' in the chromosomes when viewed under electron microscope are
A
Base pairs
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B
Genes
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C
Nucleotides
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D
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.