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

1. Genes
2. Nucleotides
3. Nucleosomes
4. Base pairs

Correct answer: Nucleosomes

Solution

Chromatin often looks like a beads-on-a-string structure under an electron microscope because DNA is wrapped around histone proteins in repeating units called nucleosomes. These are the basic packaging units of chromosomes.

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