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BIO NMDCAT Chromosomes
nmdcat.online July 4, 2026

21. During quantitative cytochemical analysis of a non-dividing somatic cell nucleus, the variable that fluctuates based on the metabolic rate of the cell is the concentration of

A. Chromosomal genomic DNA strands
B. Non-histone regulatory proteins and associated RNA transcripts
✓
C. Core structural histone H3 subunits
D. Centromeric repetitive DNA blocks

📝 Explanation

While total DNA and core structural histone quantities remain constant in a fixed G0/G1 somatic cell, the non-histone regulatory proteins, transcription factors, and active RNA transcripts shift dynamically with transcription levels.

📖 Additional Information

  • Chromosomal genomic DNA strands
  • Non-histone regulatory proteins and associated RNA transcripts
  • Core structural histone H3 subunits
  • Centromeric repetitive DNA blocks

While total DNA and core structural histone quantities remain constant in a fixed G0/G1 somatic cell, the non-histone regulatory proteins, transcription factors, and active RNA transcripts shift dynamically with transcription levels.

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