GCU BIO 181 FINAL EXAM (EXAM 4)
ACTUAL QUESTIONS AND CORRECT
ANSWERS
The lactose operon is likely to be transcribed when: - Correct answers✔The cyclic AMP and
lactose levels are both high within the cell.
The tryptophan operon is a repressible operon that is: - Correct answers✔usually on, binding of a
repressor, shuts off transcription
For a repressible operon to be transcribed, which of the following must occur? - Correct
answers✔RNA polymerase must bind to the promoter, and the repressor must be inactive.
Which of the following, when taken up by the cell, binds to the repressor so that the repressor no
longer binds to the operator? - Correct answers✔Inducer
In eukaryotes, general transcription factors: - Correct answers✔Bind to other proteins or to a
sequence element within the promoter called the TATA box.
Devices that eukaryotic cells use to regulate transcription - Correct answers✔DNA methylation
and histone modification
In a nucleosome, what is the DNA wrapped around - Correct answers✔histones
Genomic imprinting, DNA methylation, and histone acetylation= - Correct answers✔epigenetic
Gene Expression is controlled by - Correct answers✔operon model
, What is an Operon? - Correct answers✔the entire stretch of DNA that includes the operator, the
promoter, and the genes that they control
What is a promoter? - Correct answers✔Sequence where the RNA polymerase first binds and
begins transcription
What is an operator? - Correct answers✔regulatory "switch" in a segment of DNA, located in
Promoter
Repressor - Correct answers✔The operon can be switched off by a protein Prevents
gene transcription by binding to operator
Regulatory gene - Correct answers✔The repressor is the product of a separate
What happens when tryptohphan is absent? - Correct answers✔Genes for tryptophan building
enzymes remain turned on
Inducer - Correct answers✔molecules that inactivates the repressor to turn lac operon and turn on
transcription
histone acetylation - Correct answers✔acetyl groups are attached to positively charged lysines in
histone tails
Griffith observed - Correct answers✔Mixing a heat-killed pathogenic strain of bacteria with a
living nonpathogenic strain can convert some of the living cells into the pathogenic form.
ACTUAL QUESTIONS AND CORRECT
ANSWERS
The lactose operon is likely to be transcribed when: - Correct answers✔The cyclic AMP and
lactose levels are both high within the cell.
The tryptophan operon is a repressible operon that is: - Correct answers✔usually on, binding of a
repressor, shuts off transcription
For a repressible operon to be transcribed, which of the following must occur? - Correct
answers✔RNA polymerase must bind to the promoter, and the repressor must be inactive.
Which of the following, when taken up by the cell, binds to the repressor so that the repressor no
longer binds to the operator? - Correct answers✔Inducer
In eukaryotes, general transcription factors: - Correct answers✔Bind to other proteins or to a
sequence element within the promoter called the TATA box.
Devices that eukaryotic cells use to regulate transcription - Correct answers✔DNA methylation
and histone modification
In a nucleosome, what is the DNA wrapped around - Correct answers✔histones
Genomic imprinting, DNA methylation, and histone acetylation= - Correct answers✔epigenetic
Gene Expression is controlled by - Correct answers✔operon model
, What is an Operon? - Correct answers✔the entire stretch of DNA that includes the operator, the
promoter, and the genes that they control
What is a promoter? - Correct answers✔Sequence where the RNA polymerase first binds and
begins transcription
What is an operator? - Correct answers✔regulatory "switch" in a segment of DNA, located in
Promoter
Repressor - Correct answers✔The operon can be switched off by a protein Prevents
gene transcription by binding to operator
Regulatory gene - Correct answers✔The repressor is the product of a separate
What happens when tryptohphan is absent? - Correct answers✔Genes for tryptophan building
enzymes remain turned on
Inducer - Correct answers✔molecules that inactivates the repressor to turn lac operon and turn on
transcription
histone acetylation - Correct answers✔acetyl groups are attached to positively charged lysines in
histone tails
Griffith observed - Correct answers✔Mixing a heat-killed pathogenic strain of bacteria with a
living nonpathogenic strain can convert some of the living cells into the pathogenic form.
