Bio 1201 Exam 3 QUESTIONS AND ANSWERS
Enzyme complexes that break down protein are called _____.
lipases
ubiquitins
amylase
proteasomes
nucleases
proteasomes (Proteasomes are enzyme complexes that break down proteins.)
The nuclear membrane's role in the regulation of gene expression in...
Enzyme complexes that break down protein are called _____.
lipases
ubiquitins
amylase
proteasomes
nucleases
proteasomes (Proteasomes are enzyme complexes that break down proteins.)
The nuclear membrane's role in the regulation of gene expression involves _____.
protein activation
translation
protein degradation
regulating the transport of mRNA to the cytoplasm
RNA processing
regulating the transport of mRNA to the cytoplasm (This is the role of the nuclear
membrane in the regulation of gene expression.)
What is the function of a spliceosome?
protein activation
translation
protein degradation
regulating the transport of mRNA to the cytoplasm
RNA processing
RNA processing (Spliceosomes are involved in RNA processing.)
Protein-phosphorylating enzymes' role in the regulation of gene expression
involves _____.
protein activation
,translation
protein degradation
regulating the transport of mRNA to the cytoplasm
RNA processing
protein activation(Proteins are often activated by phosphorylation.)
Which statement(s) about inducible operons is/are correct?
In an inducible operon, the repressor is synthesized in an active form.
In an inducible operon, an inducer inactivates the repressor.
Inducible enzymes generally function in synthetic pathways that produce end
products from raw materials.
In an inducible operon, the repressor is synthesized in an active form.
In an inducible operon, an inducer inactivates the repressor.
(An inducible operon is usually off but can be turned on when an inducer interacts with
and inactivates the repressor. The enzymes in an inducible operon generally function in
catabolic pathways. Read about inducible operons.)
Which statement(s) about repressible operons is/are correct?
In a repressible operon, the repressor is synthesized in an active form.
Repressible operons usually contain genes that code for anabolic enzymes.
A repressible operon is on unless a co-repressor is present.
Repressible operons usually contain genes that code for anabolic enzymes.
A repressible operon is on unless a co-repressor is present.
,(A repressible operon is usually on but can be turned off when a co-repressor interacts
with and activates the repressor. The enzymes in an inducible operon generally function
in anabolic pathways. Read about repressible operons.)
How are genes coordinately controlled in eukaryotic cells?
Coordinately controlled genes in eukaryotic cells share a set of control elements.
Coordinately controlled genes in eukaryotic cells are activated by the same
chemical signals.
Coordinately controlled genes in eukaryotic cells are located together on the
same chromosome.
Coordinately controlled genes in eukaryotic cells share a set of control elements.
Coordinately controlled genes in eukaryotic cells are activated by the same chemical
signals.
(In eukaryotes, specific transcription factors bind to control elements, promoting
transcription of coordinately controlled genes, even if the genes are on separate
chromosomes. Read about coordinately controlled genes in eukaryotes.)
The operon model of the regulation of gene expression in bacteria was proposed
by _____.
Watson and Crick
Franklin
Darwin
Jacob and Monod
Mendel
Jacob and Monod
In 1961 Jacob and Monod proposed the operon model of gene regulation.
, Which of these is NOT a component of the lac operon?
lactose-utilization genes only
promoter only
regulatory gene only
operator only
promoter and operator
regulatory gene only
The regulatory gene, while not a part of the operon, plays a role in regulating the
expression of the genes of the operon.
Regulatory proteins bind to _____.
the operator
the lactose-utilization genes
the regulatory gene
RNA polymerase
transcription factors
the operator
Transcription is inhibited when a regulatory protein binds to the lac operon operator.
In the presence of a regulatory protein the lac operon is _____.
transcribed
not transcribed
transcribed at a faster than usual rate
is turned on
either transcribed or not transcribed
not transcribed
The regulatory protein of the lac operon is a repressor.
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