00:01
The question here asks us which of the following statements is true.
00:06
Statement 1 says if allolactose is absent, then lack -operon is contiguously transcribed.
00:33
Transcribed.
00:36
This statement here is false.
00:43
Why? because allolactose is an inducer of lackoperon.
00:51
Therefore if it is absent then lackopron will not work.
00:58
Moving on to statement b.
01:03
It says that if tryptophan is absent then tryptophen opron will not work this statement here is also false why because triptophen at only low levels will activate triptophen o 'pron and here the opposite thing is written.
01:54
Moving on to the next statement.
01:59
The next statement here says that if there is a structural gene, there's a structural gene and this structural gene is positively induced.
02:23
Then if a mutation occurs and activator is eliminated, then the structural gene will be expressed continuously, the structural gene will be expressed continuously.
03:08
This statement here is false.
03:13
Why? because it is the activator that causes this expression of the structural gene.
03:21
So, if the activator itself is eliminated, then structural gene will not be a expressed...