gene regulation

Question 1

operon

Answer 1

grp of genes under the sme regulatory mechanism are all transcibed in one single unit

Question 2

proteins to break down lactose is only made

Answer 2

when lactose is present

Question 3

structure of lac operon

Answer 3

promoter region
operator region
3 structural genes : lacZ
lacY
lacA

Question 4

promoter region is where

Answer 4

RNA polymerase binds

Question 5

lac I codes for

Answer 5

repressor protein that prevents transcription

Question 6

operator region

Answer 6

repressor protein binds to the operator region to prevent transcription

Question 7

when lactose is absent

Answer 7

lac genes are repressed and genes are switched off ( THIS IS CUZ LAC I IS ALWAYS ON AND PRODUCTION OF REPRESSOR PROTEINS ARE ALWAYS ON)
prevents RNA polymerase from being able to bind due to repressor region attaching to the operator region

Question 8

lactose is present

Answer 8

lactose binds to the repressor and it releases the repressor therefore, RNA polymerase can bind to the promoter and initates the transcription of lac genes