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What is virtual cDNA library?
I imagine its just an online cDNA library. A cDNA library is of course a collection of cDNA copy sequences. cDNA is where you have mRNA and you use reverse transcriptase to turn a strand of RNA into a DNA equivalent, then use RNAase H to degrade the remaining RNA strand and then use DNA polymerase to create a complete double stranded DNA sequence that is the equivalent of the mRNA. This way you can get the gene without the introns that normal DNA would have.
When isolation the gene why is better to obtain its mRNA?
mRNA does not contain introns (the original DNA does). These are sections which do not code for a functional product - such as a protein. Using mRNA you can deduce what the final (protein) product will be. It also allows you to create cDNA - which is used for storage.
In genetics what does complementary DNA mean?
Complementary DNA (cDNA) is DNA that has been copied from an mRNA through a reverse transcriptase enzyme. cDNA contains a copy of the original DNA sequence that made the mRNA - but without the introns (as these are cut out to create mRNA).
What is the use of DNA library?
cDNA is the short form complementary DNA. cDNA libraries are a combination of cloned cDNA fragments. cDNA libraries are used to express eukaryotic genes in prokaryotes.
What is the purpose of the cDNA synthesis?
The purpose of cDNA synthesis is to synthesize a copy of DNA from mRNA. This means that it is involved in the duplication of DNA that occurs when a cell divides. As a result, without cDNA synthesis, life would not exist as cells would not be able to divide.
Does a cDNA library have only exons?
A cDNA library consists only of genes that are expressed, hence they do contain only exons. They contain no introns.
What is virtual cDNA library?
I imagine its just an online cDNA library. A cDNA library is of course a collection of cDNA copy sequences. cDNA is where you have mRNA and you use reverse transcriptase to turn a strand of RNA into a DNA equivalent, then use RNAase H to degrade the remaining RNA strand and then use DNA polymerase to create a complete double stranded DNA sequence that is the equivalent of the mRNA. This way you can get the gene without the introns that normal DNA would have.
Can clones isolated from cDNA libraries contain promoter sequences?
C DNA library lack information about introns and regulatory sequences like promoter , enhancer etc.
Difference between genomic library and cdna library?
A cDNA (complementary DNA) library is a DNA library that has been created from mRNAs that are present in the cell. Since a cDNA is created from mRNA transcripts, that means that in Eukaryotic organisms there will be no introns or transcriptional factors present in the cDNA library, only exons. Only protein coding regions will be present in a cDNA library. This also means that a cDNA library is often times tissue specific. Since the expression of mRNAs will be different in different tissues of the organism it will appear different then a genomic library. Often times to offset this problem a cDNA library will be composed of different tissues (brain, liver, heart) to encompass a greater variety of the proteins that are expressed. A genomic library will contain all the exons, introns, and transcriptional factors that are not found in the cDNA library. **2/24/2011** cDNA library does contain exons, which is the protein coding regions.
When isolation the gene why is better to obtain its mRNA?
mRNA does not contain introns (the original DNA does). These are sections which do not code for a functional product - such as a protein. Using mRNA you can deduce what the final (protein) product will be. It also allows you to create cDNA - which is used for storage.
Why you chose mRNA rather than genomic DNA for making a DNA library?
Complementary DNA (cDNA) is a doublestranded DNA version of RNA . Messenger RNA is a more useful predictor of a polypeptide sequence than DNA, because the introns have been spliced out. Scientists use cDNA rather than mRNA itself because RNAs are less stable than DNA.
What is the full form of cdna?
CDNA = Complimentary Deoxyribose Nucleic Acid
In genetics what does complementary DNA mean?
Complementary DNA (cDNA) is DNA that has been copied from an mRNA through a reverse transcriptase enzyme. cDNA contains a copy of the original DNA sequence that made the mRNA - but without the introns (as these are cut out to create mRNA).
What is is the main difference between prokaryotes and eukaryotes?
Prokaryotes doesnt have a membrane its organelles pretty much just float around unlike eukaryotes it contains a membrane where the organelles are kept proteinsynthesis in prokaryotes- it doesnt not contain "noncoding" meaning it doesnt have introns
The function of cdna?
hi In vitro we must converted the RNA to cDNA to diagnosis viral RNA in PCR. In vivo RNa viral infected the cell RNA converted to cDNA IN SIDE THE CELL BY REVERSE TRANSCRIPTASE therfore cDNA insertion in the DNA of cell infected thank you hi In vitro we must converted the RNA to cDNA to diagnosis viral RNA in PCR. In vivo RNa viral infected the cell RNA converted to cDNA IN SIDE THE CELL BY REVERSE TRANSCRIPTASE therfore cDNA insertion in the DNA of cell infected thank you
How is a human gene recombined into a bacterial plasmid?
One of the most common ways these days is from cDNA. RNA is extracted from human cells, purified, and then treated with an enzyme called reverse transcriptase which is able to make DNA from RNA templates (this DNA made from RNA is called cDNA). The advantage of using cDNA is that in the genome human genes are typically distributed across multiple exons spread over tens or even hundreds of thousands of basepairs of DNA. Such a massive segment of DNA is extremely hard to manipulate and far too large to insert into a plasmid. However, in cDNA, all the introns have been spliced out (because cDNA is made from mature mRNA). To isolate a particular gene from cDNA, PCR is often used to selectively amplify one gene's cDNA using specific primers. To insert the amplified cDNA into a plasmid, the traditional approach was to use restriction enzymes - enzymes that cut precise DNA sequences. The great thing about many restriction enzymes is that they cut DNA but leave behind "sticky ends". Thus if you cut both your cDNA and a plasmid with a particular restriction enzyme, the resulting sticky ends will allow the human cDNA to be taken up by the plasmid (the sticky ends will mesh). The sticky ends will have to be sealed by an enzyme called DNA ligase. However, there are other ways these days - often involving recombination to insert the PCR product directly into a plasmid without resorting to restriction enzymes and ligations.
CDNA is copied from?
mRNA
