NEET 2017 · BiologyPrevious Year Question
The association of histone H1 with a nucleosome indicates:
Answer: (C) The DNA is condensed into a Chromatin Fibre. Answer: (C) The DNA is condensed into a Chromatin Fibre.
- A.Transcription is occurring
- B.DNA replication is occurring
- C.The DNA is condensed into a Chromatin Fibre✓
- D.The DNA double helix is exposed
Correct Answer
(C) The DNA is condensed into a Chromatin Fibre
Solution & Explanation
Answer: (C) The DNA is condensed into a Chromatin Fibre. Solution: Nucleosomes (DNA wrapped around the histone octamer) form the 'beads-on-string' chromatin; histone H1 binds linker DNA and packs the beads-on-string into the higher-order, more condensed chromatin fibre. The H1 linker histone itself is extension content; NCERT covers nucleosomes condensing into chromatin fibres. NCERT Ch 5, p.83, lines 44-45: "The beads-on-string structure in chromatin is packaged to form chromatin fibers that are further coiled and condensed at metaphase stage..."
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