The lac operon in E. coli is a set of genes that enables the breakdown of lactose when it is present in the environment. When there is no lactose, a repressor protein binds to the operator region of the operon, blocking RNA polymerase from attaching and transcribing the genes needed for lactose metabolism. In the presence of lactose, the repressor is inactivated, allowing RNA polymerase to bind to the operon and transcribe the genes required for the utilization of lactose. This regulation ensures that the genes for lactose metabolism are only expressed when lactose is available, conserving energy and resources for the cell.
The lactose (lac) operon in E. coli is a gene that helps break down lactose in the cell. If there is no lactose present, the operon is repressed. In 3-5 sentences, explain how the lac operon is used and repressed in cells. Use the following words in your response: operon, operator, repressor, RNA polymerase, and transcribe/transcription. (4 points)
Short Answer Rubric (4 points)
Points Awarded Criteria
4
The answer is very clear.
The answer is fully supported by details.
There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.
3
The answer is mostly clear.
The answer is supported by mostly relevant details.
There are a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.
2
The answer is somewhat clear.
Details are weak or not related.
There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.
1
The answer is not clear.
There are few or no supporting details.
There are many errors in grammar, usage, and mechanics. Errors interfere with meaning.
0 The question is not answered.
1 answer
1 answer