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 29 of 67

Question 281 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The presence of _______ at the place of uracil also confers additional stability to DNA.

Thymine (5-methyl uracil) is more stable than Uracil.

Question 282 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Both DNA and RNA are able to _______

Both can replicate, mutate, and express genetic information.

Question 283 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

RNA can directly code for the synthesis of _______

RNA (mRNA) directly codes for protein synthesis.

Question 284 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

DNA is dependent on _______ for synthesis of proteins.

DNA requires RNA as an intermediate to synthesize proteins.

Question 285 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Watson and Crick proposed the _______ scheme of replication of DNA.

The model suggests each new DNA molecule has one old and one new strand.

Question 286 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The experimental proof for semi-conservative replication was first shown in _______

It was first shown in E. coli by Meselson and Stahl.

Question 287 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Meselson and Stahl used the heavy isotope _______ in their experiment.

They used 15N (heavy nitrogen) to distinguish DNA densities.

Question 288 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The heavy DNA molecule could be distinguished from the normal DNA by centrifugation in a _______ density gradient.

CsCl density gradient centrifugation separates molecules based on density.

Question 289 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Taylor and colleagues used radioactive _______ to detect distribution of newly synthesized DNA in chromosomes.

Taylor used tritiated thymidine in Vicia faba.

Question 290 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The main enzyme for DNA replication is DNA-dependent _______

DNA polymerase is the main polymerizing enzyme.

Page score: 0/40