BiotechnologyNotes

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DNA structure explanation

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DNA structure by Watson and Crick to explain the double helix structure

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PCR

How do scientists copy DNA millions of times from just a tiny drop of sample?
If you’ve ever wondered how COVID tests worked, how forensic labs identify criminals, or how genetic diseases are detected, the answer is PCR.

PCR is basically a DNA photocopier.
You take a small piece of DNA, give it the right ingredients, and the machine multiplies it again and again until there’s enough to study.

What’s wild is that the entire process runs on:
primers, nucleotides, an enzyme stolen from a heat-loving bacterium, and a machine that just keeps heating and cooling your sample like a biological thermostat.

Denature.
Anneal.
Extend.
Repeat 30–40 times.
Boom, millions of DNA copies.

Whether it’s diagnosing a virus, solving a crime, cloning a gene, or doing cutting-edge research, PCR is the backbone of modern molecular biology.
Understand this…and half of biotechnology starts making sense.