In the presence of the high amounts of the simple sugar...

In the presence of the high amounts of the simple sugar glucose and the modest amounts of the sugar lactose, which of the following is true? A) The genes of the lac operon would not be transcribed. B) The catabolite activator protein would be bound to the CAP site. C) cyclic AMP levels in the cell would be low. D) the inducer allolactose would not be present in the cell

Transcript

00:01 Okay, in order to answer this question, let's talk about a transcription of lactose genes.

00:06 Imagine this is your promoter region.

00:13 And here you have, well, your dna.

00:18 Okay, and here you have the genes for, in order to, the genes that are going to cause from proteins that are going to allow for the intake of lactose from your environment to the cell.

00:30 Okay, so these are the lactose genes, suppose.

00:32 Lactose genes.

00:33 So here in next to your promoter regions, you're going to have a cap gene, or a cap region, i'm sorry, a cap region.

00:44 And here i'm going to have an operator region.

00:53 So normally this cap region is going to try to push this promoter region here in order to allow for the transcription of these lactose genes.

01:02 But the operator region is going to do the opposite.

01:04 It is going to prevent the movement of this promoter region to the transcription area.

01:10 In order to, or particularly this operator region, prevents the transcription of these genes.

01:15 Normally in this cell, there is the production of a repressor protein, and this repressor protein is normally, it is normally expressed, okay, and this is going to stimulate this operator region, so this operator is going to remain there.

01:32 So the motor region is not going to be able to start the transcription of this use.

01:37 And also, when you have a medium that is rich in glucose, for example, this is the cell, the cell membrane, when you have a glitch or an environment that is rich in glucose, then glucose or a lot of glucose molecules are going to enter the cell.

01:52 And these glucose molecules are going to inhibit the enzyme adenolide cyclase, and hence there is going to be less conversion of atp to cyclic amp...

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