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AP Bio - Chapter 13.2-13.3 (Regulation of Gene Expression)

Total questions: 30

Worksheet time: 3600secs

Name
Class
Date
1.
Most gene regulation happens at which step along the way?
a)
translation
b)
transcription
c)
signal transduction
d)
DNA replication
2.
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
3.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
4.
What does the lactose do to the Operon? 
a)
Blocks transcription because of the energy it provides
b)
Allows the repressor to be unbind from the Operator.
c)
The lactose binds the lactose and stops transcription
d)
Allows for the transcription to speed
5.
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
6.
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
7.
The "on/off" switch for an operon is called the
a)
promoter
b)
repressor
c)
operator
d)
gene
8.
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
9.
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
10.
What type of operon is the trp (tryptophan) operon?
a)
inducible
b)
repressible
c)
positive control
d)
promoible
11.
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
12.

What does the lactose do to the Operon?

a)

Blocks transcription because of the energy it provides

b)

Allows the repressor to unbind from the Operator.

c)

The lactose binds the lactose and stops transcription

d)

Allows for the transcription to speed

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

d)

tryptophan is present

14.
The production of mature mRNA in eukaryotes involves
a)
cutting introns out and spicing exons together
b)
adding the 5' cap
c)
adding the 3' poly A tail
d)
all of these are correct
15.
Protein molecules around which DNA is tightly coiled in chromatin
a)
Histones
b)
Whey
c)
Casein
d)
Hemoglobin
16.
The parts of a gene that do NOT code for amino acids in a protein are called
a)
introns
b)
exons
c)
codons
d)
anticodons
17.

What eukaryotic gene control is being represented in the image?

a)

Transcriptional control

b)

Processing control

c)

mRNA stability control

d)

Translational control

e)

Post translational control

18.

What is a Barr body?

a)

A Barr body is an X chromosome that is condensed and visible.

b)

A Barr body is an X chromosome that is not condensed nor visible.

19.

What is a feature of transcription?

a)

Both strands of a DNA molecule act as a template for mRNA.

b)

Nucleoside triphosphates become nucleotides by losing three phosphates.

c)

RNA polymerase binds to the promoter region.

d)

The sense strand acts as a template for mRNA.

20.

What is the primary function of transcription factors?

a)

Mediate the binding of RNA Polymerase to the Promoter.

b)

Mediate the binding of the Ribosome to mRNA.

c)

Help mRNA find its way to the ribosome.

d)

Transcribe the DNA template into mRNA.

21.

Intervening sequence found between exons in mRNA that is removed before translation.

a)

anticodons

b)

codons

c)

operons

d)

introns

22.

Segment of mRNA containing the protein coding portion of the gene that remains within the mRNA after splicing has occurred.

a)

codons

b)

operons

c)

introns

d)

exons

23.

Highly compacted chromatin that is not accessible for transcription.

a)

polychromatin

b)

heterochromatin

c)

euchromatin

24.

what is the function of proteasomes

a)

destroy mRNA

b)

activate genes

c)

bind to transcription factors

d)

destroy proteins

25.
Which of the following would result in a frameshift mutation?
a)
Insertions only
b)
Substitution only
c)
Deletion only
d)
Insertions and Deletions
26.
Which of the following is not a Mutagenic factor(causes mutations).
a)
X-rays
b)
Chemicals we smoke or eat
c)
Drinking water
d)
Tanning
27.
If you are missing or have an extra base  at the end of your mutated DNA . What type of mutation occurred?
a)
Substitution
b)
Frameshift
c)
Duplication 
d)
Insertion
28.
A type of substitution in which no  amino acids change is called 
a)
Missense
b)
Nonsense
c)
Silent
d)
Deletion
29.
Normal-
GAG-CTC-GAC-AGA
Mutant
GAG CTC-CAC-AGA
a)
no mutation
b)
substitution
c)
insertion
d)
deletion
30.
Why are insertion and deletion (frameshift) mutations so harmful?
a)
They change all of the codons from the mutation on down the line, which changes the amino acid sequence
b)
They insert things that an organism doesn't need.
c)
They often delete things that organisms need.
d)
Insertion and deletions are not any more harmful than substitution mutations.

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