(a) Hershey and Chase carried their experiment in three steps : infection, blending, centrifugation. Explain each step.
(b) Write the conclusion and interpretation of the result they obtained.

(a) Why did Meselson and Stahl use ""^(14)N and ""^(15)N isotopes in the sources of nitrogen present in the culture medium in their experiment. Explain. (b) Write the conclusion drawn by them from the experiment.

Describe the Hershey and Chase experiment. Write the conclusion drawn by the scientists after their experiment.

(a) Why did Hershey and Chase use radioactive ""^(32)P and ""^(35)S in their experiments? Explain. (b) Following the experiments conducted by them, write what conclusion did they arrive at and how?

How did Hershey and Chase prove that DNA is the hereditarymaterial ? Explain their experiment with suitable diagrams. Observation and Conclusions

Explain Miller and Urey experiment with the help of a neat and labelled diagram. Also write its results and conclusions

Write the formula for calculating 'Arithmetic mean'. In step deivation method and explain each letter in it.