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Chapter 6: Problem 4

What is the enzyme used in PCR? Explain why this enzyme is used for the reaction.

Short Answer

Expert verified
Taq polymerase is used in PCR because it can withstand the high temperatures of the reaction and efficiently synthesizes DNA.

Step by step solution

01

Identifying the Enzyme

The enzyme used in the Polymerase Chain Reaction (PCR) is Taq polymerase.
02

Understanding the Role of Taq Polymerase

Taq polymerase is responsible for synthesizing new DNA strands by adding nucleotides complementary to the template strand. It is a type of DNA polymerase.
03

Importance of High Temperature Stability

PCR involves repeated cycles of heating and cooling to separate DNA strands and allow enzyme function. Taq polymerase is used because it is stable at the high temperatures needed for DNA denaturation, usually around 94-98掳C, without becoming denatured itself.
04

Efficiency in DNA Amplification

Taq polymerase works efficiently at a temperature around 72掳C, which is the optimal temperature for the extension phase of PCR where Taq polymerase synthesizes the new DNA strands. This efficiency is crucial for the success of the amplification process.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

PCR
Polymerase Chain Reaction, often abbreviated as PCR, is a technique used in molecular biology to amplify a specific segment of DNA. Imagine it as a sophisticated photocopy machine for DNA fragments.

PCR involves a series of temperature changes: it begins with a high-temperature 'denaturation' phase to unwind the DNA. Then, a 'annealing' phase allows primers to bind to target sequences, and finally, the 'extension' phase facilitates new DNA strand formation.
  • Denaturation: DNA strands separate.
  • Annealing: Primers bind to target DNA.
  • Extension: DNA polymerase synthesizes new DNA strands.
These cycles are repeated multiple times, exponentially increasing the DNA quantity.
DNA synthesis
DNA synthesis in PCR is facilitated by the enzyme Taq polymerase. During the extension phase of PCR, Taq polymerase builds new DNA strands by adding nucleotides to a primer, complementing the template DNA.

This process is akin to following a blueprint, where Taq polymerase lays down the nucleotides step-by-step according to the "instructions" provided by the template strand.
  • Nucleotide addition: Complementary base pairing is maintained.
  • Template dependent: Ensures accuracy of the new DNA strand.
Taq polymerase is highly efficient, making the synthesis process quick and reliable.
Thermal stability
Thermal stability is a crucial characteristic of Taq polymerase, making it indispensable for PCR. Unlike other enzymes, Taq polymerase can maintain its function at the high temperatures used during the denaturation phase of PCR.

This unique property stems from the fact that Taq polymerase is derived from the heat-loving bacterium, Thermus aquaticus. The ability to withstand temperatures up to 98掳C without denaturing allows PCR to efficiently separate DNA strands without compromising enzyme activity.

This stability at elevated temperatures ensures consistent and continuous DNA synthesis throughout numerous PCR cycles.
DNA amplification
DNA amplification refers to the rapid and exponential increase of a particular DNA sequence using PCR. This process is essential in applications such as genetic testing, forensic analysis, and research.
  • Exponential growth: Each cycle doubles the amount of DNA.
  • Specific targeting: Only the desired DNA sequence is amplified.
The efficiency of Taq polymerase during the extension phase ensures that each cycle of PCR results in precise and robust DNA amplification, enabling scientists to work with even minute quantities of genetic material.

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Most popular questions from this chapter

What are the different steps involved in one cycle of a PCR reaction?

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