WorksheetsLac Operon Review
Total questions: 14
Worksheet time: 8mins
Name
Class
Date
1.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
2.
The "on/off" switch for an operon is called the
a)
promoter
b)
repressor
c)
operator
d)
gene
3.
Operons are found in the cells of which of the following types of organisms?
a)
prokaryotes (bacteria)
b)
eukaryotes (plant and animals)
c)
animals only
d)
viruses
4.
What is 1 in the diagram?
a)
RNA polymerase
b)
Inducer
c)
Repressor
d)
Operator
5.
What is 2 in the diagram?
a)
RNA polymerase
b)
Inducer
c)
Repressor
d)
Operator
6.
What is 4 in the diagram?
a)
RNA polymerase
b)
Inducer
c)
Repressor
d)
Operator
7.
In the top picture the operon is
a)
on
b)
off
8.
In the bottom picture the operon is
a)
on
b)
off
9.
what is an operon?
a)
a part of a ribsome
b)
a part of a Rna
c)
a unit made up of linked genes that code for proteins needed to do a specific task
d)
needed for dna replication
10.
What is the name of the stretch of DNA where RNA polymerase binds?
a)
operator
b)
promoter
c)
enhancer
d)
origin
11.
What is the role of operons in prokaryote gene expression?
a)
It makes the genes prokaryotes be turned on
b)
It accounts for the regulation of gene activity in response to the needs of the cells
c)
To make DNA for the gene
d)
To make the gene turn of and off
12.
The lac operon genes only become expressed if:
a)
lactose binds to the repressor
b)
glucose binds to the repressor
c)
lactose binds to the operator
d)
the repressor binds to the operator
13.
In the lac operon model the genes within the operon will be expressed if:
a)
lactose is absent in the cell
b)
glucose is present in the cell
c)
lactose is present in the cell
14.
How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?
a)
The two different cells become mutated
b)
The proteins expressed in each cell are different
c)
They actually have different DNA in the two types of cells.
d)
The genome of the different cells changes
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