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WorksheetsGene regulation
Total questions: 23
Worksheet time: 12mins
Name
Class
Date
1.
The "on/off" switch for an operon is called the
a)
promoter
b)
repressor
c)
operator
d)
gene
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.
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
4.
An operon consists of all the the following EXCEPT
a)
operator
b)
promoter
c)
regulatory gene
d)
genes of the operon
5.
A protein that binds to the operator and blocks the RNA polymerase
a)
regulator
b)
repressor
c)
activator
d)
corepressor
6.
A small molecule that binds to a repressor and makes it active
a)
repressor
b)
regulator
c)
activator
d)
corepressor
7.
A small molecule that binds to the repressor and makes it inactive is
a)
corepressor
b)
inducer
c)
promoter
d)
operator
8.
When a gene transcribes unless turned off by a repressor, it is considered _____ control
a)
negative
b)
positive
9.
When a gene does not transcribe unless turned on by activator , it is considered _____ control
a)
positive
b)
negative
10.
Two types of negative control are
a)
repressible & inducible
b)
repressible & active
c)
active & inactive
d)
repressible & corepressible
11.
Inducible negative control is when when the gene is transcribed by the ____ of a specific molecule
a)
presence
b)
absence
12.
Repressible negative control is when when the gene is transcribed by the ____ of a specific molecule
a)
presence
b)
absence
13.
What is an example of positive control?
a)
The lac operon being transcribed when lactose is present
b)
The trp operon being transcribed when tryptophan is absent
c)
the lac promoter being activated by CAP when cAMP levels rise
d)
control is all just an illusion
14.
All of the following are true about DNA methylation EXCEPT
a)
takes place on the DNA
b)
enzymes add a methyl group
c)
when it occurs, transcription is more likely to occur
d)
chromatin becomes more tightly packed
15.
All of the following are true about histone acetylation EXCEPT
a)
takes place on the histone
b)
enzymes add a acetyl group
c)
when it occurs, transcription is more likely to occur
d)
chromatin becomes more tightly packed
16.
Inheritance of traits by mechanisms not directly involving nucleotide sequence is called
a)
epigenetic inheritance
b)
differential gene expression
c)
chromosomal inheritance
d)
gene regulation
17.
In eukaryotes, a cluster of proteins that assemble on the promoter is called the
a)
transcription initiation complex
b)
control element
c)
activator
d)
protein blobby thing
18.
In eukaryotes, proteins that help the RNA polymerase bind to the promoter for transcription
a)
transcription factors
b)
topoisomerase
c)
regulatory genes
d)
activators
19.
A distal control region that activators bind to are bent to contact mediator proteins and form the transcription initiation complex
a)
enhancers
b)
promoters
c)
repressors
d)
transcription factors
20.
In embryonic development, the process by which cells specialize is called
a)
differentiation
b)
morphogenesis
c)
cell division
d)
endoplasmic reticulum
21.
In embryonic development, the physical process of an organism developing its shape is called
a)
differentiation
b)
morphogenesis
c)
cell division
d)
topoisomerase
22.
differentiation and morphogenesis are controlled by internal transcription factors, proteins and organelles in the cell... this is called
a)
cytoplasmic determinants
b)
inductive signals
c)
endosymbiotic theory
d)
epigenetic inheritance
23.
differentiation and morphogenesis are controlled by external factors, such as contact and signals from neighboring cells... this is called
a)
cytoplasmic determinants
b)
inductive signals
c)
endosymbiotic theory
d)
epigenetic inheritance
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