Asked by Sarah Shein on May 21, 2024
Verified
Which of the following occurs when lactose is present in the environment of E. coli?
A) The lac repressor binds to the promoter.
B) RNA polymerase binds to the operator.
C) No genes are transcribed.
D) RNA polymerase binds to the promotor.
E) Lactose binds to the promotor.
Lactose
A type of sugar found in milk and dairy products, composed of glucose and galactose units.
E. Coli
Escherichia coli, a rod-shaped bacterium that is commonly found in the intestines of warm-blooded organisms and can be either harmless or pathogenic.
Lac Repressor
A protein that binds to the lac operon and inhibits the metabolism of lactose in bacteria.
- Explain the control of gene expression at different stages, including transcriptional, posttranscriptional, translational, and posttranslational levels.
Verified Answer
HY
Humaira' YusofMay 25, 2024
Final Answer :
D
Explanation :
When lactose is present in the environment of E. coli, it binds to the lac repressor, causing it to change shape and release from the operator. This allows RNA polymerase to bind to the promoter and initiate transcription of the genes involved in lactose metabolism. Therefore, RNA polymerase binds to the promoter in the presence of lactose.
Learning Objectives
- Explain the control of gene expression at different stages, including transcriptional, posttranscriptional, translational, and posttranslational levels.
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