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Multiple Choice
Why is Taq DNA polymerase used in PCR reactions rather than a 'normal' DNA polymerase?
A
Taq DNA polymerase has a higher fidelity than normal DNA polymerases.
B
Taq DNA polymerase is resistant to the high temperatures used in PCR.
C
Taq DNA polymerase is more efficient at synthesizing DNA at room temperature.
D
Taq DNA polymerase can synthesize longer DNA strands than normal DNA polymerases.
Verified step by step guidance
1
Understand the purpose of PCR (Polymerase Chain Reaction): PCR is a technique used to amplify specific DNA sequences, making millions of copies of a particular DNA segment.
Recognize the conditions of PCR: The process involves repeated cycles of heating and cooling, with temperatures reaching around 95°C to denature the DNA strands.
Identify the role of DNA polymerase in PCR: DNA polymerase is an enzyme that synthesizes new DNA strands by adding nucleotides complementary to the template strand.
Consider the stability of enzymes at high temperatures: Most 'normal' DNA polymerases would denature and lose their function at the high temperatures used in PCR.
Learn about Taq DNA polymerase: Taq DNA polymerase is derived from the thermophilic bacterium Thermus aquaticus, which thrives in hot environments. This enzyme is heat-resistant and remains active during the high-temperature denaturation step of PCR, making it ideal for the process.