WorksheetsUnit 6 - Trp and Lac Operon
Total questions: 17
Worksheet time: 12mins
In the lac operon the inducer is
allolactose
glucose
galactose
all of the above
In the lac operon the inducer is
allolactose
glucose
galactose
all of the above
What is 1 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
What is 4 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
In the trp operon, __ acts as a __ and helps the repressor bind to the operator.
tryptophan, corepressor
tryptophan, inducer
lactose, corepressor
lactose, inducer
Match the following genetic regions to their roles:
Makes a repressor protein
Regulatory gene
Place where transcription begins
Promotor
The on/off switch where the repressor protein binds
Operator
Codes for the main protein / enzymes
Genes of Operon
The lac operon is an example of an inducible operon. Which of the following describes the process that occurs when lactose is present?
The lactose binds to the repressor which inactivates it and the repressor binds to the operator to turn translation on.
The lactose binds to the repressor which activates it and the repressor releases from the operator to turn translation on.
The lactose binds to the repressor which inactivates it and the repressor releases from the operator to turn translation on.
The lactose binds to the repressor which activates it and the repressor binds to the operator to turn translation on.
What is 5 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
What is 2 in the diagram?
RNA polymerase
Inducer
Repressor
Operator
The trp operon is an example of a repressible operon. Which of the following describes the process that occurs when tryptophan is present?
The tryptophan binds to the repressor which inactivates it and the repressor binds to the operator to turn translation off.
The tryptophan binds to the repressor which activates it and the repressor releases from the operator to turn translation off.
The tryptophan binds to the repressor which inactivates it and the repressor releases from the operator to turn translation off.
The tryptophan binds to the repressor which activates it and the repressor binds to the operator to turn translation off.
What is the primary function of the lac operon in E. coli?
To break down lactose into glucose and galactose
To synthesize lactose from glucose
To repress the synthesis of lactose
To enhance the uptake of glucose
The operon model was discovered in E. Coli and is almost exclusively found in (a) .
