Lac operon

Question 1

What happens when no lactose is present?

Answer 1

1.The lac repressor bounds to the operator so the RNA polymerase cant do anything so NO TRANSCIPTION HAPPENS

Question 2

What happens when lactose is present?

Answer 2

1. The allolactose are present so they bind to the lac repressor so it can leave the operator
2. Allowing RNA polymerase to do its role of transcribing genes so lactose is metabolised.

Question 3

What happens when there is no glucose and lactose is present

Answer 3

1.cAMP binds to the Catabolite activator proteins which binds to the CAP site making more transcription happen
2.The allolactose are present so they bind to the lac repressor so it can leave the operator as the lactose is present

Question 4

What happens when glucose and lactose are present?

Answer 4

1. Glucose is present so low cAMP so the CAP cant bind to the CAP site resulting in LESS TRANSCIPTION
   2.The allolactose are present so they bind to the lac repressor so it can leave the operator as the lactose is present

Question 5

What is the lac operon and what is lactose

Answer 5

It is a part of the E.coli genome that codes genes in the metabolism of lactose
Lactose is a sugar found in milk

Question 6

What are the different types of Lacs?

Answer 6

LacI
Lac Z
Lac Y
Lac A

Question 7

Why do CAP bind to the CAP site

Answer 7

So they can become an activator