Answer the following questions based on Meselson and Stahl’s experim

1.	Answer the following questions based on Meselson and Stahl’s experiment: (a) Write the name of the chemical substance used as a source of nitrogen in the experiment by them. (b) Why did the scientists synthesise the light and the heavy DNA molecules in the organism used in the experiment? (c) How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule? Explain. (d) Write the conclusion the scientists arrived at after completing the experiment.
Answer» (a) Ammonium chloride (NH₄Cl). (b) To check if DNA replication was semi-conservative. (c) The heavy and light DNA molecules were distinguished by centrifugation in a cesium chloride density gradient. (d) The scientists concluded that DNA replicates semi-conservatively.

Answer the following questions based on Meselson and Stahl’s experiment: (a) Write the name of the chemical substance used as a source of nitrogen in the experiment by them. (b) Why did the scientists synthesise the light and the heavy DNA molecules in the organism used in the experiment? (c) How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule? Explain. (d) Write the conclusion the scientists arrived at after completing the experiment.

Answer»

(a) Ammonium chloride (NH₄Cl).

(b) To check if DNA replication was semi-conservative.

(d) The scientists concluded that DNA replicates semi-conservatively.

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