BIO 1201 EXAM 3 QUESTIONS AND
ANSWERS 2026 VERIFIED.
Enzyme complexes that break down protein are called _____.
lipases
ubiquitins
amylase
proteasomes
nucleases - ANS 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 - ANS 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?
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,protein activation
translation
protein degradation
regulating the transport of mRNA to the cytoplasm
RNA processing - ANS 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 - ANS 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. - ANS In an inducible operon, the repressor is synthesized in an active form.
In an inducible operon, an inducer inactivates the repressor.
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,(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. - ANS 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. - ANS Coordinately controlled genes in eukaryotic cells share a set of control
elements.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 51
, 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 - ANS 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 - ANS 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.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 4 OF 51
ANSWERS 2026 VERIFIED.
Enzyme complexes that break down protein are called _____.
lipases
ubiquitins
amylase
proteasomes
nucleases - ANS 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 - ANS 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?
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 51
,protein activation
translation
protein degradation
regulating the transport of mRNA to the cytoplasm
RNA processing - ANS 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 - ANS 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. - ANS In an inducible operon, the repressor is synthesized in an active form.
In an inducible operon, an inducer inactivates the repressor.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 51
,(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. - ANS 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. - ANS Coordinately controlled genes in eukaryotic cells share a set of control
elements.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 51
, 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 - ANS 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 - ANS 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.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 4 OF 51
