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STD 12 - 5. molecular basis of inheritance — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. molecular basis of inheritance4 Marks
MCQ
What are the structures called that give an appearance as ‘beads­on­string’ in the chromosomes when viewed under electron microscope?
  • A
    Genes
  • B
    Nucleotides
  • ✓
    Nucleosomes
  • D
    Base pairs
✓

Answer

Correct option: C.
Nucleosomes
c
(c) : Nucleosomes appear as ‘beads­on­string’ in the chromosome when viewed under electron microscope. The beads in ‘beads­on­string’ arrangement are complexes of histones and $DNA$. The bead plus the connecting $DNA$ that leads to the next bead from the nucleosome. Nucleosome is the fundamental unit of organization on which the higher­ order packaging of chromatin is built. The bead of each nucleosome contains eight histone molecules in which two copies each of $H_2A, H_2B, H_3$ and $H_4$ are found.

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