MHT CET 202625 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 25 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Molecular Basis of Inheritance
MHT CET 2026 · 25 April · Morning Shift · Biology · Molecular Basis of Inheritance
In their experiment to prove DNA replication is semi-conservative,...
In their experiment to prove DNA replication is semi-conservative, Meselson and Stahl used 6M because the density gradient value of 6M is ________ the density gradient value of DNA.
Options
- Aalmost equal to
- Bdouble
- Chalf
- Done fourth to
Correct answer
A. almost equal to
Step-by-step solution
Meselson and Stahl used heavy isotope to label DNA and separated the heavy DNA from normal DNA using Cesium Chloride () density gradient centrifugation.
The density of 6M is approximately , which is almost equal to the buoyant density of DNA.
During centrifugation, a density gradient is established, and DNA molecules move to the position in the gradient where the density of the solution exactly matches their own density. Therefore, 6M was chosen because its density gradient value is almost equal to the density gradient value of DNA.
Answer: almost equal to
The density of 6M is approximately , which is almost equal to the buoyant density of DNA.
During centrifugation, a density gradient is established, and DNA molecules move to the position in the gradient where the density of the solution exactly matches their own density. Therefore, 6M was chosen because its density gradient value is almost equal to the density gradient value of DNA.
Answer: almost equal to