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Biotechnology & Genetic Modification

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Biotechnology & Genetic Modification

🧬 Scientists use living cells to produce useful things — and can even rewrite their genes to do exactly what we need

What You'll Learn

🦠 Bacteria in Biotech

Why bacteria are perfect for making medicines, food, and chemicals — fast reproduction, complex molecules, and plasmids for gene transfer.

🧪 Biotechnology Applications

How we use living things to make biofuels, bread, juice, washing powder, insulin, and meat alternatives — most use enzymes or fermentation.

🏭 Fermenters

The machines that grow microorganisms at scale — controlling temperature, pH, oxygen, nutrients, and cleanliness to produce chemicals reliably.

🔬 Genetic Engineering

Cutting genes out of one organism and inserting them into another using restriction enzymes and plasmids — creating insulin-producing bacteria and pest-resistant crops.

🌾 GM Crops

Advantages: higher yields, fewer chemicals. Disadvantages: cost, dependence on companies, gene escape, reduced biodiversity, and growth concerns.

Why Are Bacteria So Useful?

The Four Big Reasons

Bacteria are the workhorse of biotechnology. Here's why scientists love them:

Biotechnology: Using living organisms (or their cells) to produce foods and other useful chemicals that we need. It's essentially harnessing nature's factories.
1. They Make Complex Molecules

Some bacteria can produce complicated proteins and chemicals that would be expensive or impossible to synthesize in a lab. For example, certain bacteria added to milk produce enzymes that turn it into yoghurt. This is way cheaper than making those enzymes chemically.

2. They Reproduce Incredibly Fast

One bacterium can divide into two in about 20 minutes under ideal conditions. If you need 1 million units of a chemical, you don't wait months — you let bacteria multiply and produce it for you. Speed = profit.

3. Few Ethical Worries

Unlike growing animals for medical experiments, growing bacteria in huge vats doesn't raise ethical concerns — bacteria don't feel pain or suffer distress. This makes them acceptable to use in large-scale production.

4. They Have Plasmids

This is the big one for genetic engineering. Plasmids are small, circular loops of DNA floating inside bacterial cells, separate from their main chromosome.

Plasmid: A small circle of DNA inside a bacterial cell. Think of it as a "mini DNA" that bacteria can swap with each other naturally. Scientists use plasmids like tiny delivery vehicles to carry new genes into bacteria.
Why plasmids matter: Because they're separate from the main chromosome, they're easy to remove, edit, and put back. It's like the difference between editing one page in a book vs. having a sticky note you can easily modify and return.
Practice Question 1

Explain why bacteria are more suitable for large-scale production of chemicals than growing animal cells.

Biotechnology in Everyday Life

Biotechnology isn't just lab work — it's in your food, clothes, and medicine cabinet. Here's how living organisms solve real problems:

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Also in the full note
  • Fermenters: Growing Microorganisms at Industrial Scale
  • Genetic Modification: Rewriting Life's Code
  • GM Crops: Weighing the Trade-Offs
  • What to Memorise
  • Concepts Checklist
  • Exam Tips & Common Mistakes
  • 🔥 Biofuels: Energy from Yeast
  • 🍞 Bread: Rising with Yeast
What's inside
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