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WorksheetsGene Expression and Evolution
Total questions: 23
Worksheet time: 18mins
Name
Class
Date
1.
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
2.
____ is the activation of a gene that results in transcription.
a)
Gene expression
b)
Gene technology
c)
Eukaryotic expression
d)
Prokaryotic expression
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 an operon?
a)
a part of the promoter region of a gene
b)
a part of RNA polymerase
c)
a unit made up of linked genes that code for proteins needed to do a specific task
d)
A protein needed for DNA replication
5.
The "on/off" switch for an operon is called the _________.
a)
promoter
b)
repressor
c)
operator
d)
gene
6.
Which molecule can we find the promoter and terminator in?
a)
DNA
b)
mRNA
c)
tRNA
d)
polypeptide chain
7.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
8.
A small molecule that binds to the repressor protein and makes it inactive is a/an ________.
a)
corepressor
b)
inducer
c)
promoter
d)
operator
9.
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
10.
What does a promoter do?
a)
it allows a gene to be transcribed
b)
it creates a DNA segment
c)
it is another word for ribosomes
d)
it is another word for RNA
11.
Which of these is responsible for the different morphologies of these cells?
a)
Metabolism
b)
DNA Replication
c)
Gene Expression
d)
None of these account for the different morphologies
12.
What is the name of the binding site of RNA polymerase in eukaryotes?
a)
operator
b)
operon
c)
inducer
d)
promoter
13.
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
14.
What type of operon is shown in the image?
a)
inducible operon
b)
repressible operon
c)
positive control operon
d)
can't determine this from the image
15.
In a inducible operon, what turns on transcription?
a)
an inducer molecule
b)
an active repressor protein
c)
RNA polymerase
d)
the promoter
16.
What does the inducer molecule do in an inducable operon?
a)
it binds to the repressor protein allowing transcription to occur
b)
it binds to the promoter allowing transcription to occur
c)
it binds to the operator and stops transcription
d)
it binds to the repressor and stops transcription
17.
Which type of operon is shown in the image?
a)
inducible operon
b)
repressible operon
c)
positive control operon
d)
can't determine this from the image
18.
in a repressible operon, what turns on transcription?
a)
the presence of the corepressor
b)
the absence of the corepressor
c)
the presence of RNA polymerase
d)
the absence of RNA polymerase
19.
What type of operon is shown ion the image?
a)
inducible operon
b)
repressible operon
c)
positive control operon
d)
ligand operon
20.
In a positive control operon, what turns on transcription?
a)
inducer molecule
b)
ligand
c)
activator protein
d)
RNA polymerase
21.
In the lac operon, the genes within the operon will be expressed if:
a)
lactose is absent in the cell
b)
galactose is present in the cell
c)
lactose is present in the cell
d)
glucose is absent in the cell
22.
What type of operon is the lac (lactose) operon?
a)
inducible
b)
repressible
c)
positive control
d)
promoible
23.
What type of operon is the trp (tryptophan) operon?
a)
inducible
b)
repressible
c)
positive control
d)
promoible
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