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Worksheets13.4 Bio
Total questions: 10
Worksheet time: 6mins
Name
Class
Date
1.
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
2.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
3.
The "on/off" switch for an operon is called the
a)
promoter
b)
repressor
c)
operator
d)
gene
4.
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
5.
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
6.
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
7.
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
8.
The "on/off" switch for an operon is called the _________.
a)
promoter
b)
repressor
c)
operator
d)
gene
9.
What does the repressor protein do?
a)
Allows RNA polymerase to read the gene
b)
Prevents RNA polymerase from reading the gene
c)
Reads the gene
d)
Translates the gene
10.
What is a Gene?
a)
A segment of RNA that codes for a protein
b)
A chromosome
c)
A segment of DNA that codes for a protein
d)
Your genome
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