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Question
Meselson and Stahl’s experiment proved ______.
Options
Transduction
Transformation
DNA is the genetic material.
Semi-conservative nature of DNA replication.
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Solution
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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Long Answer Question:
Explain the process of DNA replication.
Semiconservative mechanism of DNA was detected using:
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Describe the process of semiconservative replication of DNA with the help of a neat and labelled diagram.
When DNA directs the synthesis of chemical molecules other than itself, then such functions of DNA are known as ______.
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Which of the following represents the autocatalytic functions of DNA?
Enzyme ______ brings about the DNA unwinding by breaking weak hydrogen bonds in the vicinity of origin.
At the point of origin, enzyme endonuclease nicks one of the strands of DNA by breaking the ______
Read the following statements and select the correct option.
Statement I: DNA replication is continuous on leading strand while on the lagging strand it is discontinuous.
Statement II: DNA polymerase cannot initialize polymerization without a primer.
In DNA molecule, pairing between two complementary nucleotides takes place by ________ bonds.
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Which of the following is classified as an autocatalytic function of DNA?
