Gene control in prokaryotes, lactose present

wh

what does allosteric mean

two bindin sites

what happens when a molecule binds at one site

affects ability of other molecule binding

site that binds DNA

separate from site that binds lactose

when lactose binds to site

shape of protein changes so DNA binding site closed

1

lactose absorbed by bacterium

2

lactose binds to repressor protein

what does lactose act as

inducer

3

shape changed for repressor protein

what happens step 3

cannot bind to DNA at operator

4

RNA polymerase can bind to promoter region

where does RNA polymerase move to step 4

along to structural genes

5

transcription no longer inhibited and RNA produced