Question
In: Biology
Bacterial gene expression (cont): A. What is an allosteric regulatory molecule? B. For the trp operon,...
Bacterial gene expression (cont):
A. What is an allosteric regulatory molecule?
B. For the trp operon, describe how this repressible operon is regulated
Solutions
Expert Solution
A. Allosreric regulatory molecule is the regulation of an enzyme
that binding site for an effector molecule or specific molecule,
the site to which the effector that binds is refered as allosteric
regulatory molecule.
B. The repressible operon is regulated by the repressor which binds
to the DNA of the operator which results in the operon is
transcribed by getting in the way of RNA polymerase.
It has two levels of regulation:
- On-off mechanism
- attuenation: it is the mechanism based on the coupling of transcription and translation.
When the trp operon is regulated by trp repressor, when trp operon is bound to tryptophan it results in the blocking expression of the operon.
when the tryptophan levels are low, the trp operon turned "on" ,when the tryptophan levels are high, the trp operon turned "off".
gladiator answered 2 years agoRelated Solutions
Bacterial gene expression (cont): A. What is an allosteric regulatory molecule? B. For the trp operon,...
Bacterial gene expression (cont):
A. What is an allosteric regulatory molecule?
B. For the trp operon, describe how this repressible operon is
regulated
What would happen to the expression of the trp operon if you replace the key tryptophan...
What would happen to the expression of the trp operon if
you replace the key tryptophan codons in the leader peptide with
tyrosine codons?
What is the function of the trp operon?
What is the function of the trp operon?
What is tryptophan?
What is an operon?
What is a promoter?
What is an operator?
What is a repressor?
Explain what are gene regulatory operons,with lac operon and tryptophan operon examples by drawing figures for...
Explain what are gene regulatory operons,with lac operon and
tryptophan operon examples by drawing figures for each?
Draw a gene regulatory diagram for an inducible operon when the ligand is not in the...
Draw a gene regulatory diagram for an inducible operon when the
ligand is not in the environment.
(a) Draw the lac operon. (b) What role does the lacI gene product play in expression of β-galacatosidase?
(a) Draw the lac operon.(b) What role does the lacI gene product play in expression of
β-galacatosidase?(c) How does the lac repressor prevent binding of RNA
polymerase?(d) What role does β-galactosidase play in regulation of the lac
operon?(e) What is the purpose of the lacY gene product?
Using your knowledge of repression and attenuation of gene expression, in the context of the Trp...
Using your knowledge of repression and attenuation of gene
expression, in the context of the Trp operon. Answer the next two
questions.
a. Give one example of how these two regulation schemes similar?
(3 points)
b. Give one example of how they are different?
Explain how ⍴-independent termination is able to halt
transcription of an mRNA molecule.
In the maturation of eukaryotic mRNA, what is the role of poly-A
addition? (2 points) What enzymes are involved in this
reaction?
In the absence of trp, what happens to the genes within the trp operon? 1. regulator...
In the absence of trp, what happens to the genes within the
trp operon?
1. regulator without tryp-binding prevents genes from
transcribing.
2. regulator falls off the operator and structural genes get
transcribed.
3. Lack of trp increases level of cAMP high, which leads to
activation of CAP protein and gene expression.
4. active repressor binds to operator and genes do not get
transcribed.
5. active activator binds to operator and transcription of the
structural gene takes place.
The trp operon: Bacterial cells can take up the amino acid tryptophan from their surroundings, or,...
The trp operon: Bacterial cells can take up the amino
acid tryptophan from their surroundings, or, if the external supply
is insufficient, they can synthesize tryptophan from small
molecules in the cell.
When external supplies of tryptophan are plentiful, the
cells suppress transcription of the trp operon, which encodes the
tryptophan biosynthetic enzymes. When external supplies of
tryptophan are not plentiful, the cells express the trp
operon.
The trp operon repressor protein inhibits transcription
of the genes in the trp...
Predict the level of gene expression of the lac operon, as well as the status of...
Predict the level of gene expression of the lac operon,
as well as the status of the lac repressor and the CAP
protein, when bacterial growth media contains the following sugars:
a) no lactose or glucose, b) lactose but no glucose, c) glucose but
no lactose, d) both lactose and glucose.
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