BIO 252 Exam 3 Questions And Correct Verified Answers Updated
Version 2026 Edition
26
20
am
Ex
n g
si
ur
26
N
20
Terms in this seet
am
Which term would be applied to a regulatory condition
Ex
that occurs when protein is associated with a particular negative control
section of DNA and greatly reduces transcription?
In the diagram below, what type of control, positive or positive control ng
si
negative, is operating?
ur
26
-{ }()-I-structrual gene-
^
N
20
{regulatory protien}
makes a transcription.
am
T/F Under a system of positive control, transcription does not occur True
unless a regulator molecule directly stimulates RNA production.
Ex
ng
si
ur
N
T/F Under a system of negative control, genetic True
,expression occurs unless some form of regulator shuts
off such expression.
26
20
am
Ex
n g
si
ur
26
N
20
am
Ex
ng
si
ur
26
N
20
am
Ex
ng
si
ur
N
, Which term is used to describe enzymes that are produced inducible: This term best describes enzymes that are produced only when specific substrates are
only when specific substrates are present in present in the environment to induce their production.
the environment?
26
Which term refers to a contiguous genetic complex that is under operon
coordinated control?
20
Things to define allosteric
am
lysogen
attenuation
prototroph
Ex
operon
Cryan experiments with gut microbes
16 interaction
ng
17 interaction
si
Which of the following mutations could lead to constitutive A mutation in the operator sequence. Such a mutation could prevent binding of the repressor,
ur
expression of the genes of the lac operon? allowing expression under all conditions.
26
N
It ensures that a cell dedicates resources to the production of enzymes involved in lactose
Which of the following best describes the biological role of the lac
20
metabolism only when lactose is available in theenvironment. The cell expends energy to
operon?
produce the proteins necessary for lactose metabolism only when lactose is present.
am
T/F The placement of the operator sequence between the True.When the repressor binds to the operator, RNA polymerase cannot
Ex
promnotor and the structural genes is critical to the proper transcribe the structural genes.
function of the lac operon.
In the lac operon, the product of structural gene lacZ is capable of splitting the β-linkage of lactose
ng
si
ur
Which termn most appropriately refers to a regulatory protein DNA binding protein
26
in prokaryotes?
N
20
am
Ex
ng
A constitutive mutation in the lac operon may be of several types. lacOc, lacl-
si
Name two types of constitutive mutations.
ur
T/F Regarding the lactose utilization system in E. coli, a
constitutive mutant is one in which the three enzymes are True
N
produced regardless of the presence or absence of
lactose.
Version 2026 Edition
26
20
am
Ex
n g
si
ur
26
N
20
Terms in this seet
am
Which term would be applied to a regulatory condition
Ex
that occurs when protein is associated with a particular negative control
section of DNA and greatly reduces transcription?
In the diagram below, what type of control, positive or positive control ng
si
negative, is operating?
ur
26
-{ }()-I-structrual gene-
^
N
20
{regulatory protien}
makes a transcription.
am
T/F Under a system of positive control, transcription does not occur True
unless a regulator molecule directly stimulates RNA production.
Ex
ng
si
ur
N
T/F Under a system of negative control, genetic True
,expression occurs unless some form of regulator shuts
off such expression.
26
20
am
Ex
n g
si
ur
26
N
20
am
Ex
ng
si
ur
26
N
20
am
Ex
ng
si
ur
N
, Which term is used to describe enzymes that are produced inducible: This term best describes enzymes that are produced only when specific substrates are
only when specific substrates are present in present in the environment to induce their production.
the environment?
26
Which term refers to a contiguous genetic complex that is under operon
coordinated control?
20
Things to define allosteric
am
lysogen
attenuation
prototroph
Ex
operon
Cryan experiments with gut microbes
16 interaction
ng
17 interaction
si
Which of the following mutations could lead to constitutive A mutation in the operator sequence. Such a mutation could prevent binding of the repressor,
ur
expression of the genes of the lac operon? allowing expression under all conditions.
26
N
It ensures that a cell dedicates resources to the production of enzymes involved in lactose
Which of the following best describes the biological role of the lac
20
metabolism only when lactose is available in theenvironment. The cell expends energy to
operon?
produce the proteins necessary for lactose metabolism only when lactose is present.
am
T/F The placement of the operator sequence between the True.When the repressor binds to the operator, RNA polymerase cannot
Ex
promnotor and the structural genes is critical to the proper transcribe the structural genes.
function of the lac operon.
In the lac operon, the product of structural gene lacZ is capable of splitting the β-linkage of lactose
ng
si
ur
Which termn most appropriately refers to a regulatory protein DNA binding protein
26
in prokaryotes?
N
20
am
Ex
ng
A constitutive mutation in the lac operon may be of several types. lacOc, lacl-
si
Name two types of constitutive mutations.
ur
T/F Regarding the lactose utilization system in E. coli, a
constitutive mutant is one in which the three enzymes are True
N
produced regardless of the presence or absence of
lactose.
