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Molecular Basis of Inheritance MCQs
Class XII Biology
•
NCERT Based
•
NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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668 questions in this chapter
Question 261 of 668
📘 CLASS XII
Chromatin appears as _______ under electron microscope.
The nucleosomes give chromatin a "beads-on-string" appearance.
Question 262 of 668
📘 CLASS XII
The packaging of chromatin at higher level requires additional set of proteins collectively referred to as _______
NHC proteins are involved in higher-level packaging.
Question 263 of 668
📘 CLASS XII
In a nucleus, some regions of chromatin are loosely packed and are referred to as _______
Euchromatin is loosely packed and transcriptionally active.
Question 264 of 668
📘 CLASS XII
The chromatin that is more densely packed and stains dark is called _______
Heterochromatin is densely packed and transcriptionally inactive.
Question 265 of 668
📘 CLASS XII
_______ is transcriptionally active chromatin.
Euchromatin allows transcription enzymes access to DNA.
Question 266 of 668
📘 CLASS XII
The transformation experiments were conducted by _______ in 1928.
Griffith conducted the transformation experiments with Streptococcus pneumoniae.
Question 267 of 668
📘 CLASS XII
Griffith worked with the bacterium _______
The experiments involved S. pneumoniae strains S and R.
Question 268 of 668
📘 CLASS XII
The S strain of Streptococcus pneumoniae produces a _______ mucous coat.
The S strain has a smooth polysaccharide capsule.
Question 269 of 668
📘 CLASS XII
Mice infected with the _______ strain die from pneumonia infection.
The virulent S strain causes death in mice.
Question 270 of 668
📘 CLASS XII
Griffith concluded that the R strain bacteria had somehow been transformed by the _______ bacteria.
The transforming principle came from the heat-killed S strain.
