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How does E. coli benefit by making enzymes to utilize lactose only when lactose is in the cellular environment?
Wiki User
∙ 13y ago
By controlling gene expression, E. coli bacteria conserve resources and produce only those proteins that are needed
Wiki User
∙ 13y ago
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Where on the lac operon does transcription take place?
The lac operon encodes enzymes required in the digestion and transport of lactose. Transcription is activated when there is lactose in the cellular environment, and RNA polymerase binds to the promoter region of the operon, and activates the expression of lacA, lacZ and lacY.
The obvious advantage of the lactose operon system is that?
lactose metabolizing enzymes need not be made when lactose is not present.
What are digestive enzymes related to lactose?
Lactase.Lactase is essential for digestive hydrolysis of lactose in milk. Deficiency of the enzyme causes lactose intolerance.
What does lactose do?
Firstly, I think you phrased this question wrong because lactose is a substrate. It is the job of lactase (and enzyme) to break down lactose. Some people are lactose intolerant because their bodies do not have enough lactase enzymes to break down lactose.
What does the lac operon lactose bind to?
lac Z, lac Y, and lac A. Enzymes for the degradation and preparation of lactose for bacterial metabolisms.
What makes some people lactose intolerant as adults?
Some people don't produce any enzymes, including the one needed to digest lactose
If a person is lactose intolerant their body cant absorb what?
Their body can't absorb lactose...There are enzymes in your small intestine which break down lactose called lactase. Lactase breaks down lactose into galactose and glucose so your body can then absorb it.
What effect do enzymes have on lactose?
That would depend upon which enzymes; lactase would break it down, others produce cheese, kefir, etc.
Why enzymes are necessary for biological process?
Enzymes are proteins which act as catalysts and allow complex chemical reactions to occur rapidly. Without enzymes, reactions would not occur quickly enough to allow cells to function effectively. For example, people who are lactose intolerant do not produce enough of the enzymes which break down lactose and therefore cannot digest lactose properly.Sources:Biology courseBrain, Marshall. "How Cells Work." HowStuffWorks. HowStuffWorks, Inc., 2002. Web. 26 Mar. 2011. .
What will happen when yeast is added to a solution of lactose?
Since yeast will only have a reaction when it is able to break down an enzyme nothing will happen when it is added to lactose. Lactose does not contain the proper enzymes or glucose to cause a reaction.
What happens when lactase is added to lactose?
When enzymes are boiled they become denatured, meaning they lose their function because they lose their shape. Any change in temperature or pH other than the one they are accustomed to will disturb an enzyme's shape; simply reverse their environment changes, and they'll go back to their correct function.
Enzymes are often bigger than the chamicals they bind to They also have a specific shape How do these facts help explain the way enzymes work?
The shape of the enzyme allows it to only accept certain substrates. For example, if you are lactose intolerable you cannot have lactose (a sugar) due to the fact that you do not have lactase (an enzyme) to break the lactose down. Enzymes, themselves, do not, split chemicals the split organic substrates such as carbohydrates, lipids (fats) and proteins.
