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Multiple Choice
What is unique about the DNA polymerase used in PCR?
A
It is heat-stable and can withstand the high temperatures of PCR.
B
It requires a primer to initiate synthesis.
C
It can synthesize RNA as well as DNA.
D
It can replicate DNA without any template.
Verified step by step guidance
1
Understand the role of DNA polymerase in PCR: DNA polymerase is an enzyme that synthesizes DNA molecules from deoxyribonucleotides, the building blocks of DNA.
Recognize the conditions of PCR: PCR (Polymerase Chain Reaction) involves repeated cycles of heating and cooling to denature DNA, anneal primers, and extend the DNA strand.
Identify the unique requirement for PCR: The DNA polymerase used in PCR must be able to withstand the high temperatures used during the denaturation step, which typically occurs around 95°C.
Learn about Taq polymerase: Taq polymerase, derived from the thermophilic bacterium Thermus aquaticus, is commonly used in PCR because it is heat-stable and can function at high temperatures without denaturing.
Clarify the role of primers: DNA polymerase requires a primer to initiate DNA synthesis, as it cannot start the synthesis of a new DNA strand on its own.