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What is the role of dNTP in PCR?
dNTPs (deoxynucleoside triphosphates) are the building blocks used by DNA polymerase to synthesize new DNA strands during PCR. They provide the necessary bases (A, T, C, G) for complementary base pairing with the template DNA strand. This results in the amplification of the target DNA sequence.
Which molecule or reaction supplies the energy for polymerization of nucleotides in the process of transcription?
DNA polymerase brings in nucleotides to add to the chain as nucleoside triphosphate (sugar +base + 3 phosphate groups). The nucleoside triphosphate gives energy to the chain in the form of phosphodiester bond.
In DNA replication why lagging strand formed in a discontinous manner?
There are two main reasons why the lagging strand is synthesized in a discontinuous manner. One you would need to have triphosphates on the 3' side of nuclesoside (3'-dNTPs) when "proofing" the strand, this would require an evolving of an entirely different set of enzymes to make 3'-dNTPs, as well as to use them. Two, you would need to have polymerases that can add a 5'-dNTP to a 5' end of a growing chain, and this is chemically unfavored due to the ease of repairing DNA errors by the 3' exonuclease activity of DNA polymerase. For the first reason, when DNA polymerase is "proof-reading" it removes an incorrect nucleotide and leaves a 3' OH. If this were the lagging strand, removal of a base would leave a 5' phosphate. Next, for addition of the correct nucleotide, a 5' phosphate bond would be cleaved to add to the 3' OH, this is a high-energy bond that is cleaved, which provides energy for polymerization. If it were the 5' phosphate, the addition would be of the 3'OH on the correct nucleotide. This would be a very slow process because there is no high-energy bond to be cleaved for addition of the 3'OH to the 5' phosphate. For the second reason, a whole new set of polymerases would have to be made because currently, the 5' dNTPs are added to the 5' triphosphate of the 3'OH on the growing strand. If you were to synthesize in the 3-5 direction, the 3'OH on the 5' dNTP would be added to the 5' triphosphate on the growing end.
What are two functions of DNA polymerases during DNA replication?
DNA Polymerase has 2 main functions. The first is replication, or creating the new DNA strand from the template it has been given. The second is proofreading the new strand after it has been created to make sure it had been copied correctly.
What do radioactive isotopes have?
Characteristics of IsotopesThe isotopes of any element will have the same number of valence electrons or valency, resulting in identical chemical properties.The isotopes' physical properties are different mainly due to the neutron number variation, present in the nucleus. Properties such as melting point, boiling point, density etc., which depend upon the atomic mass should be different for different isotopes because the isotopes of an element have different masses.
What is the use of dNTP?
The use of dNTP is PCR and multiplex PCR
What is the ratio of ddNTP to dNTP in the nucleotide mixture used for the Sanger sequencing reaction?
The ratio of ddNTP to dNTP in the nucleotide mixture for Sanger sequencing is typically 1:10.
What are the differences between DNMP and dNTP in terms of their roles in DNA replication?
DNMP stands for deoxynucleoside monophosphate, which is a building block for DNA replication. dNTP stands for deoxynucleoside triphosphate, which provides the energy needed for DNA synthesis. In summary, DNMP is a precursor for DNA replication, while dNTP provides the energy for the process.
What is the abbreviation for deoxyribonucleotide and how does it relate to genetic material?
The abbreviation for deoxyribonucleotide is dNTP. Deoxyribonucleotides are the building blocks of DNA, which is the genetic material that carries the instructions for the development and functioning of living organisms.
What is the role of dNTP in PCR?
dNTPs (deoxynucleoside triphosphates) are the building blocks used by DNA polymerase to synthesize new DNA strands during PCR. They provide the necessary bases (A, T, C, G) for complementary base pairing with the template DNA strand. This results in the amplification of the target DNA sequence.
Why is pyrophosphate an inhibitor for DNA polymerase?
The most active inhibitors are phosphonoacetate and phosphonoformate. Although not identical, the structural conditions for compounds inhibitory to CMV and HSV-1 DNA polymerase are, usually, specific, with two negatively charged groups in close vicinity.
Role of component used in PCR?
TemplateThe template consists of the DNA region which will be amplified during the reaction. The template is one of the two strands in the double helix and is the point where the new strand will start to be built.Primers:There are two primers that are complemantary to the 3’ on the DNA strand. Without them the reaction can’t start.DNA polymerase:The DNA polymerase is a polymerase enzyme that builds/synthesizes DNA molecules out of its own nucleotide building blocks. This enzyme is essential for DNA replication (which is why it’s being used in PCR) and usually, it is working in pairs since it transforms a double stranded DNA molecule into two double-stranded helixes.MgCl2 concentration:Forms a soluble complex together with dNTP which produces the substrate that the polymerese recognizes. Without this, the polymerase will have trouble starting, if at all.dNTP (Deoxynucleoside triphosphate):These are nucleotides which contains triphosphate groups. These groups, also commonly named “building blocks”, are the ones from which the DNA polymerase synthesizes a new DNA strand.
Which molecule or reaction supplies the energy for polymerization of nucleotides in the process of transcription?
DNA polymerase brings in nucleotides to add to the chain as nucleoside triphosphate (sugar +base + 3 phosphate groups). The nucleoside triphosphate gives energy to the chain in the form of phosphodiester bond.
In DNA replication why lagging strand formed in a discontinous manner?
There are two main reasons why the lagging strand is synthesized in a discontinuous manner. One you would need to have triphosphates on the 3' side of nuclesoside (3'-dNTPs) when "proofing" the strand, this would require an evolving of an entirely different set of enzymes to make 3'-dNTPs, as well as to use them. Two, you would need to have polymerases that can add a 5'-dNTP to a 5' end of a growing chain, and this is chemically unfavored due to the ease of repairing DNA errors by the 3' exonuclease activity of DNA polymerase. For the first reason, when DNA polymerase is "proof-reading" it removes an incorrect nucleotide and leaves a 3' OH. If this were the lagging strand, removal of a base would leave a 5' phosphate. Next, for addition of the correct nucleotide, a 5' phosphate bond would be cleaved to add to the 3' OH, this is a high-energy bond that is cleaved, which provides energy for polymerization. If it were the 5' phosphate, the addition would be of the 3'OH on the correct nucleotide. This would be a very slow process because there is no high-energy bond to be cleaved for addition of the 3'OH to the 5' phosphate. For the second reason, a whole new set of polymerases would have to be made because currently, the 5' dNTPs are added to the 5' triphosphate of the 3'OH on the growing strand. If you were to synthesize in the 3-5 direction, the 3'OH on the 5' dNTP would be added to the 5' triphosphate on the growing end.
What is the importance of Magnesium Chloride in PCR?
An essential cofactor for the DNA polymerase in PCR is Magnesium chloride. Its concentration must be optimized for every primer:template system. Many components of the reaction bind magnesium ion, including primers, template, PCR products and dNTPs. The main 1:1 binding agent for magnesium ion is the high concentration of dNTPs in the reaction. Because it is necessary for free magnesium ion to serve as an enzyme cofactor in PCR, the total magnesium ion concentration must exceed the total dNTP concentration. Typically, to start the optimization process, 1.5 mM magnesium chloride is added to PCR in the presence of 0.8 mM total dNTPs. This leaves about 0.7 mM free magnesium for the DNA polymerase. In general, magnesium ion should be varied in a concentration series from 1.5-4.0 mM in 0.5 mM steps.I just read somewhere that some PCR reagents require free Mg2+
What are two functions of DNA polymerases during DNA replication?
DNA Polymerase has 2 main functions. The first is replication, or creating the new DNA strand from the template it has been given. The second is proofreading the new strand after it has been created to make sure it had been copied correctly.
How many types of deoxyribonucleotides are found in DNA?
A nucleotide is a complex molecule made of n phosphates linked to one ribose linked to one nucleobase : [phosphate]n-Ribose-N. Several answers are then possible, depending on what "type" means! * If "type" refers to the number and disposition of phosphates, the answer is 5: no phosphate (it's then called a "nucleoside"), cyclic monophosphate nucleotide (cNMP), monophosphate nucleotide (NMP), diphosphate nucleotide (NDP) and triphosphate nucleotide (NTP). The number of phosphate vastly change the biological function. *if "type" refers to the nucleobase they bear, the answer is 5 major types plus some minor types. DNA contains 4 different nucleobases : adenine A, guanine G, cytosine C and thymine T. In RNA, T is replaced by uracil U (which very similar btw). As an example, the associated triphosphate nucleotides are ATP, GTP, CTP, TTP and UTP. Some other nucleobases exist which are mostly modified ATGCU. * If "type" refers to the chemical family of the nucleobase, the answer is 2 : the purines (A and G) and the pyrimidines (C, T and U). * If "type" refers to the oxidation state of the ribose, the answer is again 2 : some nucleotides have a 2-deoxyribose (dNTP) instead of a "regular" ribose (NTP). Both types perform a lot of specific biological functions, and are as well used as building block for DNA (deoxyribose-nucleotides) and RNA (ribose-nucleotides). All of these are "type" of nucleotides... and other "types" surely exist.
