🧫
Molecular Basis of Inheritance MCQs
Class XII Biology
•
NCERT Based
•
NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
This page score: 0/40
668 questions in this chapter
Question 281 of 668
📘 CLASS XII
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
Both DNA and RNA are able to _______
Both can replicate, mutate, and express genetic information.
Question 283 of 668
📘 CLASS XII
RNA can directly code for the synthesis of _______
RNA (mRNA) directly codes for protein synthesis.
Question 284 of 668
📘 CLASS XII
DNA is dependent on _______ for synthesis of proteins.
DNA requires RNA as an intermediate to synthesize proteins.
Question 285 of 668
📘 CLASS XII
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
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
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
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
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
The main enzyme for DNA replication is DNA-dependent _______
DNA polymerase is the main polymerizing enzyme.
