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Question

Under electron microscope, chromatin fibres appear like beads in a string. The beads are

A
Chromosomes
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B
Nucleosomes
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C
Solenoids
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D
Chromonemas
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Solution

The correct option is A Nucleosomes
If the chromatin is subjected to treatments that cause it to unfold partially, it can be seen under the electron microscope as a series of “beads on a string” The string is DNA, and each bead is a “nucleosome core particle” that consists of DNA wound around a protein core formed from histones.
So, the correct answer is 'Nucleosomes'.

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