“Beads-on-string” in the chromosomes?

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Nucleosomes

Chromatin

Genes

All of the above

answer is A.

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Detailed Solution

Concept- Nucleosomes are the basic structural unit of DNA.
Nucleosomes are the basic structural unit of DNA. It is present in eukaryotes and absent in prokaryotes. When nucleosomes are viewed under the electron microscope, the beads-on-strings structure appears upon chromatin. These are Nucleosomes. The fundamental unit of heredity is the gene.
Hence, option 1 is the correct answer.

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