0
What happens to lac repressentors in E coli when lactose is present?
Wiki User
∙ 12y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What happens when e coli is mixed with glucose sucrose and lactose?
E. coli will always metabolize glucose when present to avoid using excess energy to breakdown the other sugars into their subunits (lactose breaks down into glucose and galatose etc.)
What happen to lac repressor in E. coli when lactose is present?
E. coli binds with lactose which changes its conformation so that it no longer binds to DNA. This allows the lactose operon to be transcribed.
Describe how gene regulation occurs in bacterial cells?
Escherichi coli (E. coli) bacteria provide a good example of gene regulation - E. coli bacteria are genetically encoded to regulate production of enzymes that digest lactose only when lactose is present and no glucose is available.
Is E. coli lactose fermenter?
yes it is lactose positive
What prevents e coli from expressing the lac genes in its DNA all of the time?
whenever the Lactose is present the lac genes in E.coli are turn on
Lactose in take in E. coli?
it is by lac operon syastem
What happens when lactose is e coli's only food source?
The genes that produce the enzymes needed to break down lactose are not expressed.
What would you assume if you found RNA transcripts of lactose-utilizing genes within E coli?
the presence of lactose
To break down lactose Escherichia coli need three different what?
no
How does E. coli benefit by making enzymes to utilize lactose only when lactose is in the cellular environment?
By controlling gene expression, E. coli bacteria conserve resources and produce only those proteins that are needed
Lactose uptake in E. coli is an example of which type of transport?
secondary active transport
How does gene regulation of the lac operon promote homeostasis in intestinal E coli bacteria?
Lactose metabolizing enzymes need not be made when lactose is not present.This means when glucose is present, the cell does not waste energy/resources on creating these enzymes.
