Frederick Griffith performed an experiment in which a live...

Frederick Griffith performed an experiment in which a live culture of avirulent "rough" strain Streptococcus pneumoniae bacteria were mixed with dead cells of virulent "smooth" Streptococcus pneumoniae bacteria. Subsequently, the "rough" bacteria were "transformed" into "smooth" bacteria capable of killing mice. This experiment demonstrated that avirulent bacteria could transform virulent bacteria. virulence has nothing to do with heredity. molecular genetic information can be transferred between bacterial cells. bacterial virulence is unpredictable.

Transcript

00:01 Hello everyone so in this particular question we are given that frederick griff he was a sign and he performed an experiment on bacteria streptococcus new mooning and what he did in this bacteria that he took a light culture a virulent stain now streptococcus muone has two strain one is rough strain and the second is smooth strain so the rough strain that he took it is a virulent that is not capable of causing a disease and killing a particular organism but the smooth strain which is the virulent one it is capable of killing a particular organism and in this particular experiment he took mice that if he injected the smooth strain so the mice was killed but if the rough strain individually was injected so the mice did survive so what happened that he mixed the light rough strain and the dead smooth strain so now in the question i will be referring rough strain to be the r and smooth strain to be s.

01:04 Now what was the result that he could see? the result that he saw here was that this rough strain here was transformed into smooth strain that after the mixture was injected into the mice.

01:19 So he saw that the mice could not survive.

01:24 But the life strain was the r1.

01:27 But and dead was the smooth one so he concluded that some transformation did occur which caused the rough strain to transform into smooth strain now we are given with the options and we need to tick the correct option that what was the conclusion right so first of all from here we can clearly make out from all the situation that i did tell you that there might have some transformation occurring because of which the r strain gained the capacity or we can say the r strain became virulent to kill the mice right so what happens that a transformation principle from the killed s train and by s train i mean the smooth one right because i had mentioned it so a transforming principle from killed s train what it did that it enabled the r strain it enabled the r strain to synthesize smooth polysaccharide code to synthesize the smooth polysaccharide code and this was virulent and hence there was a transfer of genetic material.

02:52 So this was the whole conclusion about this experiment.

02:57 Now let's move on to our options that are given to us.

03:00 So our option a here says that a virulent bacteria could transform the virulent...

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