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WorksheetsRegulation of Gene Expression
Total questions: 21
Worksheet time: 11mins
Observe the pic then answer the question that follows.
Question: Gene regulation is the process that is used to:
help make sugars for cells in plants.
turning genes on and off.
make glycosomes in cells.
Not sure. Code RED need help.
When gene expression occurs
A gene is mutated with either an insertion or deletion
The gene is removed from the genotype in that cell
The gene is passed on to the daughter cells during mitosis
The gene is activated and used in protein synthesis
Which reason explains why nerve cells function differently than muscle cells?
In nerve cells all the genes are expressed.
In muscle cells all the genes are expressed.
In both kinds of cells the same genes are expressed.
In both kinds of cells different genes are expressed.
An operon is
a genetic on/off switch in prokaryotes
a genetic on/off switch in eukaryotes
a group of related genes and the associated gene switches in prokaryotes
a group of related genes and the associated gene switches in eukaryotes
In the trp operon, __ acts as a __ and helps the repressor bind to the operator.
tryptophan, corepressor
tryptophan, inducer
lactose, corepressor
lactose, inducer
Where does the RNA Polymerase bind to for the initiation of
Regulator
Structural genes
Operator
Promotor
RNA polymerase needs --- to initiate transcription.
holoenzymes
transcriptional factors
histones
microRNA
which is correct?
heterochromatin-dense, no transcription;
euchromatin- not dense, transcription
euchromatin-dense, no transcription;
heterochromatin- not dense, transcription
histone acetylation- increase transcription; histone methylation (and DNA methylation)- decrease transcription
histone methylation- increase transcription; histone acetylation- decrease transcription
True or False: All of your body cells contain the same genes.
True
False
What is the final step of regulation of gene expression?
Protein folding
Protein breakdown
Regulation of translation
Gene splicing
Which of the following would most likely be an "on," or highly expressed, gene?
A gene in heterochromatin
A gene with a short poly-A tail
A gene with alot of introns
A gene with a strong promoter
Heterochromatin
Usually has methylated DNA
Usually does not have acetylated histones
contains genes that are not expressed
All of these are true
Prokaryotes regulate gene expression primarily
in order to maintain homeostasis
in response to changing environmental conditions
during development as cells specialize
Prokaryotes do not regulate gene expression. All genes are always on.
One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.
transcriptional
translational
post-transcriptional
post-translational
In order for a gene to be expressed, ___ must bind to the gene's ___, a specific sequence of nucleotides at one end of the gene, thus initiating transcription.
DNA polymerase, promotor
DNA polymerase, operator
RNA polymerase, promotor
RNA polymerase, operator
Eukaryotes need to regulate their genes
during cell specialization that occurs during development
in order to maintain homeostasis
both a and b
neither a or b
___ are DNA sequences which are often located far from the genes they regulate in eukaryotes where transcription activators can bind.
histones
promotors
enhancers
Which of the following help to turn genes on so that they are expressed (transcribed and translated)?
a high level of condensation (coiling around histones)
histone acetylation
DNA methylation
histone methylation
Which of the following are types of post-transcriptional control of genes in eukaryotes?
alternative RNA splicing or processing
gene silencing through RNA interference
destruction of ubiquitin tagged proteins
all of the above
Alternative RNA splicing involves
removing introns and splicing the same exons together
removing exons and splicing the same introns together
removing introns and splicing different exons together
removing exons and splicing different introns together
