(a) Describe the series of experiments of F. Griffith. Comment on the significance of the results obtained.
(b) State the contribution of Macleod, McCarty and Avery.

(a) Describe the various steps of Griffith's experiment that led to the conclusion of the 'Transforming Principle'. (b) How did the chemical nature of the 'Transforming Principle' get established ?

(a) Describe the various steps of Griffith's experiment that led to the conclusion of the 'Transforming Principle'. (b) How did the chemical nature of the 'Transforming Principle' get established ?

(a) Describe the various steps of Griffith's experiment that led to the conclusion of the 'Transforming Principle'. (b) How did the chemical nature of the 'Transforming Principle' get established?

(a) Describe the various steps of Griffith's experiment that led to the conclusion of the 'Transforming Principle'. (b) How did the chemical nature of the 'Transforming Principle' get established ?

Describe Avery, McLeod and McCarty's experiment. State its significance.

In a series of experiments with Streptococcus and mice F. Griffith concluded that R-strain bacteria had been transformed. Explain.

Comprehension-1 Two closed identical conducting containers are found in the laboratory of an old scientist. For the vertification of the gas some experiments are performed on the two boxes and the results are noted. Experimenet 1. When the two containers are weighed W_(A) = 225tg, W_(B) = 160 g and mass of evacuated container W_(C) = 100g . Experiment 2. When the two containers are given same amount of heat same temperature rise is recorded. The pressure changes found are DeltaP_(A) = 2.5 atm, Deltap_(B) = 1.5 atm . Required data for unknown gas: |(underset("molar mass")(Mono)",He,Ne,Ar,Kr,Xe,Rd),(,4g,20g,40g,84g,131g,222g),(underset(molar mass)(Dia),H_(2),F_(2),N_(2),O_(2),CI_(2),),(,2g,19g,28g,32g,71g,)| Identify the gas filled in the container A and B .

Comprehension-1 Two closed identical conducting containers are found in the laboratory of an old scientist. For the vertification of the gas some experiments are performed on the two boxes and the results are noted. Experimenet 1. When the two containers are weighed W_(A) = 225tg, W_(B) = 160 g and mass of evacuated container W_(C) = 100g . Experiment 2. When the two containers are given same amount of heat same temperature rise is recorded. The pressure changes found are DeltaP_(A) = 2.5 atm, Deltap_(B) = 1.5 atm . Required data for unknown gas: |(underset("molar mass")(Mono)",He,Ne,Ar,Kr,Xe,Rd),(,4g,20g,40g,84g,131g,222g),(underset(molar mass)(Dia),H_(2),F_(2),N_(2),O_(2),CI_(2),),(,2g,19g,28g,32g,71g,)| Total number of molecules in 'A' (here N_(A) = Avagadro number)

Comprehension-1 Two closed identical conducting containers are found in the laboratory of an old scientist. For the vertification of the gas some experiments are performed on the two boxes and the results are noted. Experimenet 1. When the two containers are weighed W_(A) = 225tg, W_(B) = 160 g and mass of evacuated container W_(C) = 100g . Experiment 2. When the two containers are given same amount of heat same temperature rise is recorded. The pressure changes found are DeltaP_(A) = 2.5 atm, Deltap_(B) = 1.5 atm . Required data for unknown gas: |(underset("molar mass")(Mono)",He,Ne,Ar,Kr,Xe,Rd),(,4g,20g,40g,84g,131g,222g),(underset(molar mass)(Dia),H_(2),F_(2),N_(2),O_(2),CI_(2),),(,2g,19g,28g,32g,71g,)| Total number of molecules in 'A' (here N_(A) = Avagadro number)

(a) Explain Griffith's series of experiments where he witnessed transformation in bacteria he worked with. (b) Name the scientists responsible for determining the biochemical nature of "transforming principle" in Griffith's experiments. What did they prove?