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Describe the effect a repressor has on the lac operon when lactose is present?
Wiki User
∙ 13y ago
When lactose is present, the lactose binds to the repressor and changes the shape of the repressor.
Wiki User
∙ 13y ago
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A lac repressor turns off the lac genes by binding to?
When the lac repressor binds to the O region, RNA polymerase is prevented from beginning the process of transcription. In effect, the binding of the repressor protein turns the operon "off" by preventing the transcription of its genes. (Prentice Hall Biology Book .....Chapter 12 page 310)
What is the effect of prokaryote invaders?
ribosomes present
What does cause-and-effect pattern mean?
- Cause andeffect:Using the cause and effect pattern, a writer tries to describe why something happens, or what results of an occurrence are or were.This particular form of writing is crucial because it is integrated in most other forms.
How would you describe the gram stain?
Describe the Gram stain technique and the effect on Gram-positive and Gram-negative bacteria after each step. Be very specific about what is happening at each step and why it happens. (hint: be sure to fully explain your answer and not just list the steps)
Describe biopsychology and its theoretical framework?
Bio[psychology is a branch of psychology that attempts to study how the brain processes information. Changes in brain chemistry can have a direct effect on changes in behavior.
When lactose is present in bacterial does it prevent the blocking effect of the repressor protein and allow the transcription of lactose metabolizing genes?
Yes. A precursor to lactose binds to the repressor and prevents or relaxes its binding to the Lac operon.
When lactose is present in bacterial cell's it prevents the blocking effect of the repress or protein and allows the transcription of lactose metabolizing gene true or false?
false
A lac repressor turns off the lac genes by binding to?
When the lac repressor binds to the O region, RNA polymerase is prevented from beginning the process of transcription. In effect, the binding of the repressor protein turns the operon "off" by preventing the transcription of its genes. (Prentice Hall Biology Book .....Chapter 12 page 310)
What was Platos effect on present day?
What was Caesars effect on present day? What was Caesars effect on present day?
When you write a cause and effect essay you describe?
you describe the cause and effect
What might be an effect of the decrease in their production of lactase?
Their bodies cannot digest as much lactose as other people's bodies.
Describe the green house effect and it's effect on the earth's climate?
Certain gases present in the atmosphere like CO2 ,CH4 absorb the sun's heat and keep the planet warm this is known as greenhouse effect It increases the temperature of the earth it keeps the earth warm during night
For most of the worlds population what is the effect of aging on the activity of lactase?
As people age, their bodies often produce less lactase, the enzyme needed to digest lactose found in dairy products. This can lead to lactose intolerance, causing symptoms such as bloating, gas, and diarrhea when consuming dairy. However, lactase persistence, where the enzyme continues to be produced into adulthood, is more common in some populations.
Describe how E. coli uses the negative and positive control of the lac operon to economize on RNA and protein synthesis?
if a regulatory protein in its active state turns off the expression of the operon, the operon is said to be negatively regulated by the regulatory protein. if the regulatory protein in its active state truns on the operon, the operon is positively regulated by the regulatory protein. an operon regulated by a repressor is therefore negatively regulated, because the presence of the active repressor prevents transcription of that operon. in contrast, an operon regulated by an activator is positively regulated, because in its active state the activator protein turns on transcription of the operon under its control. the lac operon of E. coli repressor(lac repressor) is synthesized through the activity of the gene lac I, known as regulator gene. the active form of the lac repressor, is a tetramer that contains four copies of the gene I product. in the absence of the inducer, the repressor binds to the lac operator sequence, preventing RNA polymerase from binding to the promoter and transcribing the structural genes. thus the lac operon is negatively regulated associated with the lac operon, there is another site, 16 base pairs upstream of the promoter, which is used for a positive control of the gene expression. this site is called catabolic activator protein site or cyclic AMP(cAMP) protein site or catabolite gene activator(cga) site, because it is utilized for binding of CAP or cga to stimulate gene expression. CAP can bind to this site only when it is bound with cAMP. by binding to it, the CAP-cAMP complex exerts a positive control over the transcription process. it has an effect exactly opposite to that of repressor binding to an operator. yhe effector molecule cAMP determines the effect of CAP on lac operon transcription. presence of glucose inhibits the formation of cAMP and prevents it to bind to CAP
What is the effect of changing the present tense to the past tense?
Changing the present tense to the past tense indicates that an action or event has already happened. It can give a sense of completion or shift the focus to something that occurred before the current moment. It can also add distance from the action or event, providing context or historical perspective.
When did the present constitution go into effect?
1789
What is the effect of prokaryote invaders?
ribosomes present
