Biotechnology is the use of living organisms, cells, or biological processes to create useful products, improve processes, or solve problems.

The word can be divided into two parts:

• Bio means life or living organisms.
• Technology means the use of knowledge, tools, and techniques to solve problems.

Biotechnology therefore combines biology and technology.

Humans have been using biotechnology for thousands of years. Early forms included using microorganisms to make bread, cheese, and fermented foods. Modern biotechnology can involve manipulating DNA, growing cells in laboratories, and genetically modifying organisms.

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Why Do We Use Biotechnology?

The main purpose of biotechnology is to use biological systems to produce something useful or solve a problem.

Biotechnology can help us:

• produce medicines and vaccines
• improve food production
• develop crops with useful characteristics
• diagnose diseases
• manufacture useful chemicals and enzymes
• treat waste and pollution
• produce renewable fuels
• study genes and inherited characteristics

Biotechnology has become important in medicine, agriculture, industry, food production, and environmental science.

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Living Organisms as Biological Tools

One of the most important ideas in biotechnology is that living organisms can act as biological tools.

Scientists may use whole organisms, individual cells, enzymes, or genetic material.

Microorganisms

Bacteria and yeast can grow rapidly and carry out useful chemical reactions.

For example, yeast converts sugars into carbon dioxide and ethanol during fermentation.

This process is used in:

• bread making
• brewing
• biofuel production

Enzymes

Enzymes are biological catalysts produced by living organisms. They speed up chemical reactions and can be used in many industrial processes.

For example, enzymes are used in:

• biological washing detergents
• food processing
• cheese production
• fruit juice production

Cells

Scientists can grow cells under controlled laboratory conditions. These cells can be used to study diseases, test medicines, or produce useful biological substances.

DNA

Modern biotechnology allows scientists to study and sometimes alter an organism's genetic material.

This can allow organisms to produce substances that they would not normally produce.

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Traditional Biotechnology

Traditional biotechnology uses living organisms and biological processes without directly manipulating their DNA.

Humans were using these techniques long before they understood microorganisms, cells, or genetics.

Fermentation

Fermentation by microorganisms has been used for thousands of years.

For example:

Bread

Yeast breaks down sugars and produces carbon dioxide.

The carbon dioxide becomes trapped in the dough, causing it to rise.

Yogurt

Bacteria convert lactose into lactic acid, helping produce yogurt's characteristic texture and flavour.

Cheese

Microorganisms and enzymes are used to change milk into cheese.

Selective Breeding

Humans have also selectively bred plants and animals for desirable characteristics.

Farmers may choose organisms with characteristics such as:

• larger fruits
• higher milk production
• faster growth
• disease resistance

These organisms are bred so that desirable characteristics are more likely to appear in future generations.

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Modern Biotechnology

Modern biotechnology uses advanced scientific techniques to study or manipulate cells, genes, and biological molecules.

A major development in modern biotechnology has been our ability to work directly with DNA.

Modern techniques include:

• genetic engineering
• DNA sequencing
• gene editing
• tissue culture
• cloning
• production of genetically modified organisms
• production of medicines using genetically modified microorganisms

For example, bacteria can be genetically modified to contain the human gene for insulin. The bacteria then use this genetic information to produce human insulin, which can be purified and used as a medicine.

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Traditional vs Modern Biotechnology

Both forms of biotechnology use biological systems for useful purposes.

The major difference is the level of control scientists have over the biological processes involved.

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Biotechnology in Everyday Life

Biotechnology may sound highly specialised, but many biotechnology products are part of everyday life.

Food

Microorganisms are used to produce:

• bread
• yogurt
• cheese
• vinegar
• fermented foods

Medicine

Biotechnology is used to produce and develop:

• insulin
• vaccines
• antibiotics
• diagnostic tests
• some forms of gene and cell therapy

Agriculture

Biotechnology can help produce:

• disease-resistant crops
• pest-resistant crops
• crops with improved nutritional characteristics
• plants produced rapidly through tissue culture

Household Products

Some laundry detergents contain enzymes produced using microorganisms.

These enzymes help break down substances such as:

• proteins
• fats
• starches

This helps remove stains from clothing.

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Major Fields of Biotechnology

Biotechnology covers a wide range of scientific fields.

Medical Biotechnology

Medical biotechnology uses biological processes to improve human health.

Applications include:

• vaccines
• medicines
• diagnostic tests
• genetic testing
• gene therapy
• production of hormones such as insulin

Agricultural Biotechnology

Agricultural biotechnology aims to improve crops, livestock, and food production.

Applications include:

• selective breeding
• genetically modified crops
• disease-resistant plants
• tissue culture
• improved crop yields

Industrial Biotechnology

Industrial biotechnology uses organisms, cells, and enzymes to manufacture useful products.

Applications include:

• enzymes
• biofuels
• chemicals
• food ingredients
• biodegradable materials

Environmental Biotechnology

Environmental biotechnology uses biological processes to help protect or restore the environment.

Applications include:

• wastewater treatment
• decomposition of waste
• pollution control
• bioremediation

Bioremediation involves using organisms, particularly microorganisms, to remove or break down pollutants.

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Biotechnology and Human Problems

Biotechnology is particularly powerful because organisms have already evolved the ability to perform an enormous variety of chemical processes.

Instead of designing every process from the beginning, scientists can sometimes use or modify biological systems.

For example:

Problem: A patient cannot produce enough insulin.

Biotechnology solution: Genetically modified bacteria can produce human insulin.

Problem: Wastewater contains organic pollutants.

Biotechnology solution: Microorganisms can break down many of the pollutants during wastewater treatment.

Problem: Farmers need large numbers of genetically similar plants.

Biotechnology solution: Tissue culture can produce many plants from a small amount of plant tissue.

Biotechnology therefore applies our understanding of living systems to practical human needs.

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Benefits and Challenges of Biotechnology

Biotechnology has the potential to provide major benefits to society, but some applications also raise important questions.

Potential benefits include:

• improved healthcare
• increased food production
• reduced environmental pollution
• development of new medicines
• more efficient industrial processes

However, scientists and society must also consider issues such as:

• safety
• environmental effects
• cost and accessibility
• animal welfare
• genetic privacy
• ethical concerns about modifying organisms

As biotechnology becomes more powerful, understanding both its scientific possibilities and its consequences becomes increasingly important.

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Did You Know?

Biotechnology is much older than modern genetics.

Humans were using yeast to make bread and fermented drinks thousands of years before anyone knew that microorganisms existed. Modern biotechnology builds on these ancient biological processes using our much greater understanding of cells, DNA, genes, and enzymes.

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Key Vocabulary

Biotechnology — The use of organisms, cells, or biological processes to produce useful products or solve problems.

Traditional biotechnology — The use of naturally occurring biological processes without directly manipulating DNA.

Modern biotechnology — The use of advanced biological techniques involving cells, genes, DNA, or other biological molecules.

Fermentation — A process in which microorganisms break down substances such as sugars, often producing useful products.

Genetic engineering — The deliberate modification of an organism's genetic material.

Selective breeding — Choosing organisms with desirable characteristics to reproduce.

Bioremediation — The use of organisms to remove or break down environmental pollutants.

Tissue culture — Growing cells or tissues under controlled laboratory conditions.

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Key Takeaways

• Biotechnology combines biology and technology to produce useful products and solve problems.
• Humans have used biotechnology for thousands of years.
• Traditional biotechnology includes fermentation and selective breeding.
• Modern biotechnology can involve working directly with cells, genes, and DNA.
• Organisms, microorganisms, enzymes, cells, and DNA can all be used as biological tools.
• Biotechnology is important in medicine, agriculture, industry, food production, and environmental protection.
• Everyday examples include bread, yogurt, medicines, detergents, and agricultural products.
• Modern biotechnology provides powerful solutions to human problems but can also raise important safety, environmental, and ethical questions.