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NEET2026BiologyChapterActual

Which of the following statements are correct regarding the packaging of DNA helix in eukaryotes? A. A typical nucleosome contains 200 bp of DNA helix. B. The 'beads-on-string' structure in chromatin is clearly seen when viewed under a light microscope. C. Chromatin fibres are further coiled and condensed at metaphase stage of cell division to form chromosomes. D. Euchromatin is densely packed and stains dark. E. Euc

Options

  1. AA, C and E only
  2. BA, B and D only
  3. CB, D and E only
  4. DC, D and E only

Correct answer

A. A, C and E only

Step-by-step solution

Statement A is correct. A typical nucleosome contains about 200 bp of DNA helix wrapped around the histone octamer. Statement B is incorrect. The 'beads-on-string' structure in chromatin is observed under an electron microscope, not a light microscope. Statement C is correct. Chromatin fibres are further coiled and condensed at the metaphase stage of cell division to form chromosomes. Statement D is incorrect. Euchromatin is loosely packed and stains light, whereas heterochromatin is densely packed and stains dark.

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