You are repeating the Hershey-Chase experiment and are provided with two isotopes: 32P and 15N (in place of 35S in the original experiment). How do you expect your results to be different?

Give an account of Hershey and Chase experiment. What did it conclusively prove? If both DNA and proteins contained phosphorusand sulphur do you think the result would have been the same?

What are the oxidation number of the underlined elements in 'each of the following and how do you rationalise your results? H_2S_4O_6

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?

How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies?

Identify the following nuclides as :isotopes isobars and isotones _1^3H,_2^4He,_6^14C,_17^38CI,_7^14N,_12^24Mg,_17^35CI,_16^32S,_15^31P