1|Page
ASU BIO 340 Exam 3 ||Verified Exam!!!|| Most Recent
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already Graded
A+ | Guaranteed Success!! | Newest Exam!!!
What will be the effect on transcription when an inhibitor is
in play?
A. Allow transcription B. Prevent transcription - Answer-B
Explanation: An inhibitor prevents activator from binding to
DNA; activators are used in positive regulation (increasing
transcription) - thus, the inhibitor prevents the activator
from positive regulating (increasing) transcription.
What will be the effect on transcription when an inducer is
in play?
A. Allow transcription B. Prevent transcription - Answer-A
Explanation: When an inducer is in play, it will allow
transcription.
For a gene under positive control, which of the following
would prevent transcription?
A. Repressor B. Corepressor C. Inducer D. Effector E.
Inhibitor - Answer-E Explanation: Positive regulation
includes activators (affected by effectors and inhibitors);
,2|Page
inhibitors prevent activator from binding to DNA, thus
preventing transcription.
For a gene under negative control, which of the following
would you expect to find bound to the repressor if there is
active transcription? A. Repressor B. Corepressor C.
Inducer D. Effector E. Inhibitor - Answer-C Explanation: In
negative regulation, there are repressors (affected by
correpressors and inducers). If there were a corepressor,
the repressor would successfully bind to the operator and
prevent transcription. Inducers, however, prevent the
binding of the repressor - thus causing a prevention of it
doing its job, and allowing transcription.
Which molecule serves as the inducer for the lac operon?
A. cAMP B. Glucose C. Lactose D. Allolactose - Answer-D
Explanation: Allolactose is the molecule that binds to
repressor protein, making it unable to bind to the operator.
Which of the following conditions will result in the greatest
levels of transcription of the lac operon?
A. Lactose absent, glucose absent B. Lactose absent,
glucose present C. Lactose present, glucose present D.
Lactose present, glucose absent - Answer-D Explanation:
,3|Page
From the perspective of the cell, it is most efficient to
repress expression of the genes allowing for metabolism
of lactose when it's absent, to allow it when present, but
only to prioritize it when glucose (the preferred food
source) is absent. In C, allolactose will also be present,
allowing transcription, but positive regulation (i.e. increase
in transcription) only happens as in D, when glucose is
absent.
Describe the experiments that led to the discovery of DNA
as the hereditary meterial - Answer-1. The bacterial
transforming principle by Griffith:
found that nonvirulent R-strain takes up a transforming
principle from the virulent heat-killed S-strain. This allowed
the R-strain to transform into S-strain becoming virulent.
2. Avery-MacLeod-McCarty Experiment:
S-strain filtrate was made and treated with RNase, Dnase,
Protease, and Carboase. Those were then treated with the
R-strain and found that the only dample containing both
both strains was the one with Dnase.
3. The Hershey Chase experiment:
Officially concluded that DNA was genetic material from
work with phages.
, 4|Page
What were the conclusions for the three experiments that
led to DNA being the hereditary meterial? - Answer-1. The
bacterial transforming principle by Griffith:
found that nonvirulent R-strain takes up a transforming
principle from the virulent heat-killed S-strain. This allowed
the R-strain to transform into S-strain becoming virulent.
2. Avery-MacLeod-McCarty Experiment:
DNA is the transforming factor
3. The Hershey-Chase Experiment:
DNA is the genetic material
What are the building blocks of DNA - Answer-nucleotides
What are nucleotides composed of? - Answer-5 carbon
sugar, phosphate group, nitrogenous base
A, T, G, C
Nucleotides combine via___ - Answer-covalent bonds
Nucleotides are assembled into polynucleotide chains by:
a. endonuclease
ASU BIO 340 Exam 3 ||Verified Exam!!!|| Most Recent
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already Graded
A+ | Guaranteed Success!! | Newest Exam!!!
What will be the effect on transcription when an inhibitor is
in play?
A. Allow transcription B. Prevent transcription - Answer-B
Explanation: An inhibitor prevents activator from binding to
DNA; activators are used in positive regulation (increasing
transcription) - thus, the inhibitor prevents the activator
from positive regulating (increasing) transcription.
What will be the effect on transcription when an inducer is
in play?
A. Allow transcription B. Prevent transcription - Answer-A
Explanation: When an inducer is in play, it will allow
transcription.
For a gene under positive control, which of the following
would prevent transcription?
A. Repressor B. Corepressor C. Inducer D. Effector E.
Inhibitor - Answer-E Explanation: Positive regulation
includes activators (affected by effectors and inhibitors);
,2|Page
inhibitors prevent activator from binding to DNA, thus
preventing transcription.
For a gene under negative control, which of the following
would you expect to find bound to the repressor if there is
active transcription? A. Repressor B. Corepressor C.
Inducer D. Effector E. Inhibitor - Answer-C Explanation: In
negative regulation, there are repressors (affected by
correpressors and inducers). If there were a corepressor,
the repressor would successfully bind to the operator and
prevent transcription. Inducers, however, prevent the
binding of the repressor - thus causing a prevention of it
doing its job, and allowing transcription.
Which molecule serves as the inducer for the lac operon?
A. cAMP B. Glucose C. Lactose D. Allolactose - Answer-D
Explanation: Allolactose is the molecule that binds to
repressor protein, making it unable to bind to the operator.
Which of the following conditions will result in the greatest
levels of transcription of the lac operon?
A. Lactose absent, glucose absent B. Lactose absent,
glucose present C. Lactose present, glucose present D.
Lactose present, glucose absent - Answer-D Explanation:
,3|Page
From the perspective of the cell, it is most efficient to
repress expression of the genes allowing for metabolism
of lactose when it's absent, to allow it when present, but
only to prioritize it when glucose (the preferred food
source) is absent. In C, allolactose will also be present,
allowing transcription, but positive regulation (i.e. increase
in transcription) only happens as in D, when glucose is
absent.
Describe the experiments that led to the discovery of DNA
as the hereditary meterial - Answer-1. The bacterial
transforming principle by Griffith:
found that nonvirulent R-strain takes up a transforming
principle from the virulent heat-killed S-strain. This allowed
the R-strain to transform into S-strain becoming virulent.
2. Avery-MacLeod-McCarty Experiment:
S-strain filtrate was made and treated with RNase, Dnase,
Protease, and Carboase. Those were then treated with the
R-strain and found that the only dample containing both
both strains was the one with Dnase.
3. The Hershey Chase experiment:
Officially concluded that DNA was genetic material from
work with phages.
, 4|Page
What were the conclusions for the three experiments that
led to DNA being the hereditary meterial? - Answer-1. The
bacterial transforming principle by Griffith:
found that nonvirulent R-strain takes up a transforming
principle from the virulent heat-killed S-strain. This allowed
the R-strain to transform into S-strain becoming virulent.
2. Avery-MacLeod-McCarty Experiment:
DNA is the transforming factor
3. The Hershey-Chase Experiment:
DNA is the genetic material
What are the building blocks of DNA - Answer-nucleotides
What are nucleotides composed of? - Answer-5 carbon
sugar, phosphate group, nitrogenous base
A, T, G, C
Nucleotides combine via___ - Answer-covalent bonds
Nucleotides are assembled into polynucleotide chains by:
a. endonuclease
