Operons and Promoters in Eukaryotic/Prokaryotic gene expres.

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Operons and Promoters in Eukaryotic/Prokaryotic gene expres.

Post by MelC2005 » Thu Dec 08, 2005 11:24 pm

Why do Prokaryotes have operons and why do all eukaryotic gene have their own promoter?

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Post by GreenDog » Thu Dec 08, 2005 11:51 pm

Why Operons:
Procaryotes are small organisms which live in a rapidly changing environment. The most important thing for them, is to react in a quick and accurate way to the everchanging conditions. For example a bacteria lived in a place where Glucose was abundant, suddenly it disappeared and only lactose has left. Now it has to switch very fast to lactose usage. The best thing is to turn on all the genes related to lactose at the same time, in order to stay alive. When Glucose comes back all those genes have to be turned off at the same time to avoid waist of energy.
So why Eucaryotes don't use operons?
Eucaryotes occupy a different Ecological niche, they are more complex and more dependant of each other then Procaryotes. They do not have to react so fast to environment- they have each other, but they have to make sure that everything is done correctly to prevent large damage to the organism. It means they need very tight supervision on everything or in other words Regulation. Individual promoters give the ability to make a much finer regulation.
"When In Danger Or In Doubt Run In Circles Scream And Shout"
Lawrence J. Peter

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