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What are those structures that appear as beads-on-string in the chromosomes

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

Options

(a) Genes
(b) Nucleotides
(c) Nucleosomes
(d) Base pairs

Correct Answer:

Nucleosomes

Explanation:

Under electron microscope the nucleosomes appear as beads on string in chromosome, due to a short length of DNA wrapped around a core of histone proteins.

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