Euchromatin vs Heterochromatin — NEET Biology
📚 Practice ConceptNon-histone Chromosomal (NHC) proteins. In a typical nucleus, some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. The chromatin that is more densely packed and stains dark are called as Heterochromatin. Euchromatin is said to be transcriptionally active chromatin, whereas heterochromatin is inactive.
Assertion (A): Different regions of chromatin show different packing densities and staining properties. Reason (R): Euchromatin is densely packed and stains dark while heterochromatin is loosely packed and stains light.
View solution & NCERT explanation
Correct answer: C — If assertion is true but reason is false.
NCERT describes chromatin regions with different packing and staining, making the Assertion true. However, NCERT states “Some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. The chromatin that is more densely packed and stains dark are called as Heterochromatin” - the Reason reverses these properties, making it false.
What does NCERT say about Non-histone Chromosomal NHC proteins?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.