00:01
This question refers to a very famous experiment detailing the pathogenicity of certain bacterial organisms.
00:09
So in this experiment, you had an r strain, or a rough bacterial strain, and you had an s strain or a smooth.
00:19
So this experiment, you had a rough bacterium where inside the host, the host organism's immune system would be able to kill off the bacterium, whereas the smooth strain of bacterium was surrounded by, a capsule which could avoid the immune system of the host and it would survive.
00:38
So this experiment consisted of four different combinations of these groups.
00:44
In the rough group you had a mouse that was infected with just this single bacterium of the rough strain and it would survive.
00:55
Its immune system would be able to fight off this bacterium and it would fight the infection and live.
01:01
For the smooth strain, the mouse was similarly infected but this time because of the capsular layer the mouse died off and was not able to fight the infection so here the mouse died a third experiment they killed the s strain and they added a live r strain so in this experiment only the live r was introduced to the mouse and here of course the rough the live r did not kill the mouse.
01:41
However, in this experiment, the mouse died off...