Class XII · Biology practice

Molecular Basis of Inheritance MCQs

Check your understanding, bookmark questions and revisit your mistakes.

Page score: 0/40

Choose an answer to begin.

Practice scoring: +4 correct, 0 incorrect. Filters apply to this page. Use timed tests for negative marking.

Answers and bookmarks are saved in this browser, across visits. They do not sync to your account.

668 questions in this collection · Page 27 of 67

Question 261 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Chromatin appears as _______ under electron microscope.

The nucleosomes give chromatin a "beads-on-string" appearance.

Question 262 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

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

Molecular Basis Of Inheritance

_______ is transcriptionally active chromatin.

Euchromatin allows transcription enzymes access to DNA.

Question 266 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The transformation experiments were conducted by _______ in 1928.

Griffith conducted the transformation experiments with Streptococcus pneumoniae.

Question 267 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Griffith worked with the bacterium _______

The experiments involved S. pneumoniae strains S and R.

Question 268 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The S strain of Streptococcus pneumoniae produces a _______ mucous coat.

The S strain has a smooth polysaccharide capsule.

Question 269 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Mice infected with the _______ strain die from pneumonia infection.

The virulent S strain causes death in mice.

Question 270 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Griffith concluded that the R strain bacteria had somehow been transformed by the _______ bacteria.

The transforming principle came from the heat-killed S strain.

Page score: 0/40