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NEET BIOLOGYMedium

Read the following statements and choose the set of correct statements: (a) Euchromatin is loosely packed chromatin (b) Heterochromatin is transcriptionally active (c) Histone octamer is wrapped by negatively charged DNA in nucleosome (d) Histones are rich in lysine and arginine (e) A typical nucleosome contains 400 bp of DNA helix

A

(a), (c), (e) only

B

(b), (d), (e) only

C

(a), (c), (d) only

D

(b), (e) only

Step-by-Step Solution

Based on the provided sources and standard biological principles:

  • Statement (a) is correct: Euchromatin is the region of chromatin that is loosely packed and stains lightly.
  • Statement (b) is incorrect: Heterochromatin is densely packed and transcriptionally inactive, whereas euchromatin is transcriptionally active.
  • Statement (c) is correct: Negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called a nucleosome .
  • Statement (d) is correct: Histones are basic proteins that acquire a positive charge due to the abundance of basic amino acid residues, specifically lysine and arginine.
  • Statement (e) is incorrect: A typical nucleosome contains approximately 200 base pairs (bp) of DNA helix, not 400 bp.
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Solved: BIOLOGY Question for NEET | Sushrut