Pcr Components And Their Functions Pdf

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Polymerase chain reaction PCR is a method widely used to rapidly make millions to billions of copies of a specific DNA sample, allowing scientists to take a very small sample of DNA and amplify it to a large enough amount to study in detail. It is fundamental to much of genetic testing including analysis of ancient samples of DNA and identification of infectious agents.

Polymerase Chain Reaction (PCR)

Polymerase chain reaction PCR is a technique for detecting, quantifying and amplifying nucleic acids. The basic PCR mechanism involves the use of an enzyme called DNA polymerase to synthesize complementary strands of DNA from a denatured double-stranded template , effectively doubling the original sample with every cycle of the PCR reaction. This molecular copying operates through cycles of thermal reactions enabled by an assembly of biochemical reagents, and amplifies a few copies of DNA to millions. Amplified DNA can then be analyzed qualitatively for its presence , quantitatively by amount or sequentially for its genetic code , and used in downstream molecular biology applications. Since its development by Kary Mullis in , PCR has revolutionized the molecular biology field, giving rise to many advantageous techniques that allow the analysis of different nucleic acids.

PCR Overview

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Login Sign up Search for courses, skills, and videos. Introduction to genetic engineering. Polymerase chain reaction PCR. Applications of DNA technologies. Practice: Biotechnology.

Polymerase chain reaction PCR , a technique used to make numerous copies of a specific segment of DNA quickly and accurately. The polymerase chain reaction enables investigators to obtain the large quantities of DNA that are required for various experiments and procedures in molecular biology , forensic analysis , evolutionary biology, and medical diagnostics. PCR was developed in by Kary B. Mullis , an American biochemist who won the Nobel Prize for Chemistry in for his invention. Before the development of PCR, the methods used to amplify, or generate copies of, recombinant DNA fragments were time-consuming and labour-intensive.


The required basic components are. ➢DNA template ➢4 different nucleotides, differing in the base ➢PCR procedure (cycling, components). ➢Lamina flow.


Chemical Components of PCR

In the biological sciences there have been technological advances that catapult the discipline into golden ages of discovery. For example, the field of microbiology was transformed with the advent of Anton van Leeuwenhoek's microscope, which allowed scientists to visualize prokaryotes for the first time. The development of the polymerase chain reaction PCR is one of those innovations that changed the course of molecular science with its impact spanning countless subdisciplines in biology. The theoretical process was outlined by Keppe and coworkers in ; however, it was another 14 years until the complete PCR procedure was described and experimentally applied by Kary Mullis while at Cetus Corporation in Automation and refinement of this technique progressed with the introduction of a thermal stable DNA polymerase from the bacterium Thermus aquaticus , consequently the name Taq DNA polymerase.

A basic PCR set up requires several components and reagents. Two primers that are complementary to the 3' ends of each of the sense and anti-sense strand of the DNA target DNA polymerase can only bind and elongate from a double-stranded region of DNA, and without primers there is no double-stranded initiation site for polymerase to bind. Deoxynucleoside triphosphates dNTPs, sometimes called "deoxynucleotide triphosphates"; nucleotides containing triphosphate groups , the building-blocks from which the DNA polymerase synthesizes a new DNA strand. The temperatures used and the length of time they are applied in each cycle depend on a variety of parameters.

What is PCR (polymerase chain reaction)?

The characterization of the diversity of species living within ecosystems is of major scientific interest to understand the functioning of these ecosystems. It is also becoming a societal issue since it is necessary to implement the conservation or even the restoration of biodiversity. Historically, species have been described and characterized on the basis of morphological criteria, which are closely linked by environmental conditions or which find their limits especially in groups where they are difficult to access, as is the case for many species of microorganisms. The need to understand the molecular mechanisms in species has made the PCR an indispensable tool for understanding the functioning of these biological systems. A number of markers are now available to detect nuclear DNA polymorphisms.

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2 Response
  1. Mirella S.

    following equation: Tm (oC) ≅ 2(NA+NT)+4(NG+NC). DNA POLYMERASE. There are 2 common polymerases used for PCR, Taq and Pfu. The typical.

  2. Neududinsdec

    The next component is the PCR Reaction Buffer. MgCl2 will stand up to repeated freezing and thawing, the dNTPs are a different story. It is best to obtain them.

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