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Genetics
In DNA replication,which enzyme separates the two strands?
Genetics
A dog with long eyelashes mates with one that has short eyelashes assuming that long eyelashes are dominant over short eyelashes and that the dog with long eyelashes is heterozgous for the trait find the F1 genearation
Genetics
A gene called “PRNP” produces the prion protein. In humans there are two alleles for the gene,
known as “Met” and “Val”. People who are homozygous for the Met allele can contract
“variant CJD”, the fatal human form of mad cow disease associated with the consumption of
infected beef.
In Denmark, a survey of 352 individuals found that 131 were homozygous for Met, 168 were
heterozygous, and 53 were homozygous for Val. Is the PRNP gene in Hardy-Weinberg
equilibrium? Show your calculations.
known as “Met” and “Val”. People who are homozygous for the Met allele can contract
“variant CJD”, the fatal human form of mad cow disease associated with the consumption of
infected beef.
In Denmark, a survey of 352 individuals found that 131 were homozygous for Met, 168 were
heterozygous, and 53 were homozygous for Val. Is the PRNP gene in Hardy-Weinberg
equilibrium? Show your calculations.
Genetics
In Denmark, a survey of 352 individuals found that 131 were homozygous for Met, 168 were heterozygous, and 53 were homozygous for Val. Is the PRNP gene in Hardy-Weinberg equilibrium? Show your calculations. (4 marks)
Genetics
What is the accepted method for proving that cells derived from bone marrow are true HSCs? Briefly describe the method.
Genetics
I'm in search of a good topic for my term paper but I'm lacking ideas. Could you suggest some on which I can write minimum 15 pages.
Genetics
Is there a good book that explains operons: lac operon and trp operon in details.
I was reading the functioning of the trp repressor protein from 'Principles of genetics-by Snustard and Simmons',they have mentioned that the binding of the repressor-corepressor complex to Operator prevents the transcription of the structural genes. But they don't explain how.
Khan academy says that the repressor-corepressor complex physically comes in the way of the RNA polymerase. They have used this diagram below which shows that the large RNA polymerase cannot bind to the promoter site due to steric hindrance.
For the diagram: http://biology.stackexchange.com/questions/50757/problem-in-understanding-operon
I'm looking for a more authentic source to study exactly how this RNA polymerase is being prevented from transcribing the DNA in both the operons.
I was reading the functioning of the trp repressor protein from 'Principles of genetics-by Snustard and Simmons',they have mentioned that the binding of the repressor-corepressor complex to Operator prevents the transcription of the structural genes. But they don't explain how.
Khan academy says that the repressor-corepressor complex physically comes in the way of the RNA polymerase. They have used this diagram below which shows that the large RNA polymerase cannot bind to the promoter site due to steric hindrance.
For the diagram: http://biology.stackexchange.com/questions/50757/problem-in-understanding-operon
I'm looking for a more authentic source to study exactly how this RNA polymerase is being prevented from transcribing the DNA in both the operons.
Genetics
My question is related to the following diagram:
https://en.wikipedia.org/wiki/File:Trpoperon.svg
Does -//- sign between trpR and P indicate separation of the trpR gene from the operon? Or could the sign mean that the trpR gene may be present adjacent or far away from the operon, both the possibilities?
https://en.wikipedia.org/wiki/File:Trpoperon.svg
Does -//- sign between trpR and P indicate separation of the trpR gene from the operon? Or could the sign mean that the trpR gene may be present adjacent or far away from the operon, both the possibilities?
Genetics
What is genetic code? Enlist the characteristics of a genetic code
Genetics
Is induction and derepression the same thing?
In lac operon when Allolactose molecule is present in the medium (in the bacterial cell) it binds to the monomer of repressor and reduces the binding affinity of repressor to the operator site and the RNA polymerase is free to synthesis a polycistronic mRNA. Thus the allolactose molecule turns on the expression of lac operon by removing repression.
So I conclude that in lac operon induction is same as derepression. But does it hold true for all operons or there are operons in which induction is achieved without repressing the repressor?
In lac operon when Allolactose molecule is present in the medium (in the bacterial cell) it binds to the monomer of repressor and reduces the binding affinity of repressor to the operator site and the RNA polymerase is free to synthesis a polycistronic mRNA. Thus the allolactose molecule turns on the expression of lac operon by removing repression.
So I conclude that in lac operon induction is same as derepression. But does it hold true for all operons or there are operons in which induction is achieved without repressing the repressor?
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