Worksheetslac operon
Total questions: 10
Worksheet time: 5mins
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
Which of the following is not a structural gene?
lacZ
lacY
lacA
lacI
Functioning unit of DNA containing a cluster of genes under the control of a single regulatory signal or promoter is termed as
Operon
Operator
Lac
Repressor protein
Which of the following conditions leads to maximal expression of the lac operon?
lactose present, glucose absent
lactose present, glucose present
lactose absent, glucose absent
lactose absent, glucose present
lac operon can be found in
E. coli
lactose
human colon
glucose
The structural gene that codes for protein that increase the permeability of the plasma membrane towards lactose is.
lacI
lacZ
lacY
lacA
Which sentence is TRUE about structural genes in the absence of lactose?
Transcription occurred to synthesis enzyme
Translation occurred to synthesis mRNA
Transcription occurred to synthesis mRNA
No transcription and translation occurred
If a promoter was being deleted in lac operon, what would be the effect towards lac operon in the absence of lactose?
RNA polymerase can transcribe the structural genes
Enzymes are being produced
Repressor protein will change its shape
RNA polymerase cannot bind to lac operon
