00:01
Which of these statements about the lack opron is false? a, the lack repressor binds when lactose is present.
00:08
B, even when the cap activator is bound to dna.
00:11
If lactose is not present, the lack opron will not be transcribed.
00:16
C, the cap activator can only bind dna if bound to camp.
00:21
Or d, the lack opron only produces rna if lactose is present and glucose is absent.
00:28
Okay, so the lackopron, this is controlling the genes involved in.
00:31
In metabolizing lactose as an alternative energy source if glucose is not available.
00:37
So first of all, d is a true statement, so it's not going to be our answer.
00:41
It is active when lactose is present and glucose is absent.
00:46
So that's when lactose needs to be metabolized.
00:50
So how does this regulation work? well, the lackopron has two means of regulation, better mentioned here.
00:57
First, it has a repressor, and second, it has an activator.
01:03
So the activator is the cap protein.
01:06
And the cap protein does not interact with the promoter.
01:14
Well, it's upstream of the promoter, but it doesn't bind to the cap binding site unless camp is present.
01:22
Binds to its binding site when camp binds to cap...