Nucleosomes Disaggregate – Chemistry Hw
The key terms of Chemistry Homework include, Nucleosomes Disaggregate.
Nucleosomes disaggregate to allow transcription and then reaggregate
by acetylation and deacetylation
a cell that contains three Barr bodies will necessarily have
four X chromosomes
Catabolite repression refers to the
shutdown of transcription from many operons when glucose is present in the medium
which of the following is a chromosomal mutation?
inversion
in a semiconservative replication of dna,
the strands of the double helix separate and act as templates for new strands.
A bacterial gene regulatory system is likely to have all of the following except
introns
Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene?
alternative splicing
Suppose that a certain enzyme is synthesized whenever the solution in which the cells are growing lacks substance X. When substance X is present, the enzyme is produced only under certain environmental conditions. This phenomenon would most likely be an example of _______ gene regulation.
Repressible
heterochromatin
contains poly a tails
the TATA box is a(n)
sequence close to the promoter region of many genes
the barr body is evidence for
x-chromosome inactivation
How are inducible and repressible systems similar
In both systems the regulatory molecules function by binding to the operator
The mechanism by which the inducer causes the repressor to detach from the operator is an example of
allosteric regulation
An inducer…Select one:
a. binds to the termination codons and allows protein synthesis to continue.
b. combines with a repressor and prevents it from binding the promoter.
c. combines with a repressor and prevents it from binding the operator.- correct
d. binds to the promoter and prevents the repressor from binding to the operator.e. binds to the operator and prevents the repressor from binding at this site.
RNA polymerase by itself cannot bind to the chromosome and initiate transcription. It can bind and act only after regulatory proteins called _______ factors have been assembled.
transcription
Transcription factors are
proteins that bind to the DNA promoter sequence
A promoter is the region of
DNA that binds RNA polymerase
Which molecule is used to mark or label proteins for destruction?
Ubiquitin
Imagine that the TATA box for gene X becomes highly methylated. How will this affect the expression of gene X?
Gene X will not be transcribed or translated.
You are studying the effects of specific transcription factors on the activation of gene expression. You notice that one particular transcription factor binds far away from the promoter of its target gene. What can explain this?
DNA looping brings the transcription factor closer to the promoter and initiates gene transcription.
Nucleosomes disaggregate to allow transcription and then reaggregate
by acetylation and deacetylation
a cell that contains three Barr bodies will necessarily have
four X chromosomes
Catabolite repression refers to the
shutdown of transcription from many operons when glucose is present in the medium
which of the following is a chromosomal mutation?
inversion
in a semiconservative replication of dna,
the strands of the double helix separate and act as templates for new strands.
A bacterial gene regulatory system is likely to have all of the following except
introns
Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene?
alternative splicing
Suppose that a certain enzyme is synthesized whenever the solution in which the cells are growing lacks substance X. When substance X is present, the enzyme is produced only under certain environmental conditions. This phenomenon would most likely be an example of _______ gene regulation.
Repressible
heterochromatin
contains poly a tails
the TATA box is a(n)
sequence close to the promoter region of many genes
the barr body is evidence for
x-chromosome inactivation
How are inducible and repressible systems similar
In both systems the regulatory molecules function by binding to the operator
The mechanism by which the inducer causes the repressor to detach from the operator is an example of
allosteric regulation
An inducer…Select one:
a. binds to the termination codons and allows protein synthesis to continue.
b. combines with a repressor and prevents it from binding the promoter.
c. combines with a repressor and prevents it from binding the operator.- correct
d. binds to the promoter and prevents the repressor from binding to the operator.e. binds to the operator and prevents the repressor from binding at this site.
RNA polymerase by itself cannot bind to the chromosome and initiate transcription. It can bind and act only after regulatory proteins called _______ factors have been assembled.
transcription
Transcription factors are
proteins that bind to the DNA promoter sequence
A promoter is the region of
DNA that binds RNA polymerase
Which molecule is used to mark or label proteins for destruction?
Ubiquitin
Imagine that the TATA box for gene X becomes highly methylated. How will this affect the expression of gene X?
Gene X will not be transcribed or translated.
You are studying the effects of specific transcription factors on the activation of gene expression. You notice that one particular transcription factor binds far away from the promoter of its target gene. What can explain this?
DNA looping brings the transcription factor closer to the promoter and initiates gene transcription.