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प्रश्न
Meselson and Stahl’s experiment proved ______.
विकल्प
Transduction
Transformation
DNA is the genetic material.
Semi-conservative nature of DNA replication.
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उत्तर
Meselson and Stahl’s experiment proved Semi-conservative nature of DNA replication.
Explanation:
The Meselson and Stahl experiment (1958) definitively proved that DNA replication is semiconservative, meaning each new DNA molecule consists of one original parental strand and one newly synthesised strand. By growing E. coli bacteria in heavy nitrogen (15N) and then switching them to a medium with light nitrogen (14N), the researchers used density gradient centrifugation to observe the DNA’s weight over generations. They found that after one generation, all DNA was of intermediate density (a hybrid of heavy and light), and after two generations, half the DNA was hybrid and half was entirely light, which confirmed that the parent strands separate and serve as templates for new matching strands.
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संबंधित प्रश्न
______ enzymes are used as biological scissors in r-DNA technology.
Very Short Answer Question:
When does DNA replication takes place?
During DNA replication, the separated strands of DNA are prevented from recoiling by
Describe the process of semiconservative replication of DNA with the help of a neat and labelled diagram.
______ heavy isotope was used by Meselson and Stahl during their experiment.
E. coli, in which both the strands of DNA are labeled with 15N is transferred to 14N medium and allowed to replicate for three generations. What would be the number of hybrid DNA molecules in the third generation?
Which one of the following correctly represents the manner of replication of DNA?
Which of the following technique was used by Meselson and Stahl to demonstrate the semiconservative mode of DNA replication?
Assertion (A): DNA replication is said to be semi-conservative.
Reason (R): After DNA replication, each daughter molecule has one old and one new strand.
Which of the following term correctly describes the movement of ribosome on the mRNA?
In DNA molecule, pairing between two complementary nucleotides takes place by ________ bonds.
"DNA is considered as genetic material" - Why?
Extension of the plasma membrane in a prokaryotic cell is ______.
During replication of DNA Okazaki fragments are formed in the direction:
The nucleic acid synthesis takes place in ______.
In prokaryotes, the primers of lagging strands are removed by ______.
Which scientists first proposed the semi-conservative model of DNA replication based on the structure of the double helix?
According to the conservative model of DNA replication, the original DNA double strand would:
