Summary
Repeated cycles of denaturing, annealing and extending exponentially amplify a target DNA region.
In depth
Cycle: denature (95 °C), anneal primers (50 to 65 °C), extend (72 °C). After 30 cycles, about a billion copies. Requires template, primers, dNTPs and heat-stable polymerase. qPCR monitors amplification in real time.
Primer design affects specificity: melting temperatures matched, length 18 to 25 bases, no strong secondary structures. Negative controls detect contamination. Variants: nested, multiplex, digital PCR.
Remember: PCR amplifies a specific segment between two primers, not the whole genome.
Frequently asked questions
What is Polymerase Chain Reaction?
Repeated cycles of denaturing, annealing and extending exponentially amplify a target DNA region.
Which area of biology covers Polymerase Chain Reaction, and how advanced is it?
Polymerase Chain Reaction is one of the 56 topics in Biotechnology & Genomics. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Next-Generation Sequencing, Southern, Northern and Western Blots, Liquid Biopsy.
Can you give an example of Polymerase Chain Reaction?
PCR detects viral RNA after reverse transcription.
What should I learn before Polymerase Chain Reaction?
Work through the Beginner topics in Biotechnology & Genomics first, such as Biotechnology, Genetic Engineering, Selective Breeding, then return to Polymerase Chain Reaction. Intermediate topics assume the Beginner vocabulary.
What topics are related to Polymerase Chain Reaction?
The closest topics to Polymerase Chain Reaction are Next-Generation Sequencing, Southern, Northern and Western Blots, Liquid Biopsy, DNA Sequencing. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Polymerase Chain Reaction?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Polymerase Chain Reaction. To practise the whole of Biotechnology & Genomics, use the Biotechnology & Genomics quiz.
How is Polymerase Chain Reaction different from Next-Generation Sequencing?
Polymerase Chain Reaction: Repeated cycles of denaturing, annealing and extending exponentially amplify a target DNA region. Next-Generation Sequencing: Massively parallel methods that read millions of DNA fragments simultaneously, cutting cost and time. Read both side by side and note what each one explains.
How should I study Polymerase Chain Reaction step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Next-Generation Sequencing and explain the difference aloud. Finally, take the Biotechnology & Genomics quiz and come back to this page for any question you miss.