00:01
We'll discuss about lac operon.
00:03
What is lac operon? it is a combination of gene which is responsible for regulation of transcription.
00:09
Let us see its structure first.
00:10
So this is the structure of a lac operon.
00:14
Just as...
00:15
In the structure of lack operon, here we will have in the first block inducer, which is indicated by i, p, promoter and then we have operator.
00:24
These three are the structural genes which are responsible for different, which are responsible for different.
00:30
Types of chemicals which are further responsible for another mechanisms.
00:36
Z is responsible for beta galactosidase, y for permease and a is for transacetylase.
00:42
Let's not go into the detail, we'll just discuss the basics and focus on our question then.
00:47
So if lactose is present in our e .col -sary, sorry, lack -operon system, lactose binds to the inducer and causes transcription.
01:00
All right? in presence of lactose, what happens is, in presence of lactose, a repressor protein is formed, something like this, which binds to the operator regions and do not allow any transcription.
01:16
Therefore, if you want for your lack operon to transcribe or to do the transcription, presence of lactose is very, very necessary...