Biotechnology and its Applications covers how engineered organisms and genes are turned into useful products across agriculture, medicine and industry, from Bt crops and RNAi pest resistance to recombinant insulin, gene therapy and transgenic animals. It also looks at the ethics, biopiracy and GEAC regulation behind GMOs. For NEET this is a high-yield, fact-dense chapter where direct one-mark questions on Bt toxin, golden rice, Humulin and ADA gene therapy are common.
Class 12 Biology · Chapter 10 – swipe through all 10 cards to understand the whole chapter.
What Biotechnology Delivers
Applied biotechnology turns living systems into useful products for agriculture, medicine and industry.
GMO = an organism whose genes have been altered by manipulation.
- Every bioprocess needs the best catalyst (improved microbe/enzyme)
- Plus optimal conditions (temperature, pH, substrate) for it to work
- Plus downstream processing to purify the final product
Three Application Fields & Food Routes
NCERT names three fields where biotech is applied, against the backdrop of how we grow more food.
Don’t confuse the 3 research problems with the 3 application fields.
- Food routes: agrochemical, organic, genetically engineered farming
- Green Revolution tripled food but needed costly agrochemicals
- Biotech offers GMOs as a more sustainable alternative
Genetically Modified Crops
GM crops are engineered to resist stress and pests and to improve nutrition.
Also reduces pesticide use and post-harvest losses.
- Tolerate abiotic stress: cold, drought, salt, heat
- Reduce pesticide dependence and post-harvest losses
- Raise mineral-use efficiency and nutritional value
Bt Toxin & the cry Gene
Bacillus thuringiensis makes an insecticidal protein whose gene is engineered into crops.
Gene is written cry (lowercase, italic); protein is Cry.
- cryIAc, cryIIAb → cotton bollworms (lepidopterans)
- cryIAb → corn borer
- Bt cotton is the classic NEET example
How Bt Toxin Kills the Insect
The toxin is stored harmlessly until an insect’s gut activates it.
Bacterium is safe because the toxin stays an inactive protoxin (crystal).
- Insect eats inactive protoxin crystals
- Alkaline pH of insect gut solubilises and activates the toxin
- Active toxin binds midgut epithelium, forms pores, insect dies
RNA Interference (RNAi)
A cellular defence in eukaryotes that silences a specific mRNA using complementary dsRNA.
This is post-transcriptional gene silencing; needs a dsRNA trigger.
- dsRNA binds the complementary mRNA and blocks translation
- Used to make tobacco resistant to nematode Meloidogyne incognita
- Genes delivered via Agrobacterium; parasite can’t survive
Recombinant Insulin (Humulin)
Human insulin was the first genetically engineered protein therapeutic.
Eli Lilly, 1983: A and B chains made separately in E. coli, then joined.
- Body first makes pro-insulin with an extra C-peptide
- C-peptide is removed during maturation
- Recombinant route avoids allergy from animal-source insulin
Gene Therapy & Molecular Diagnosis
Correcting a faulty gene, and detecting disease before symptoms appear.
Lymphocyte ADA cDNA is temporary; permanent cure needs early embryonic bone-marrow cells.
- Gene therapy inserts a normal gene to correct a defect
- PCR amplifies tiny pathogen nucleic acid (HIV, cancer)
- ELISA uses antigen-antibody interaction for early detection
Transgenic Animals
Animals carrying a deliberately introduced foreign gene; over 95% are mice.
Molecular pharming = making valuable proteins in animals.
- Uses: study physiology, disease models, biological products
- Also vaccine safety testing and chemical (toxicity) testing
- First transgenic cow = Rosie; product = human alpha-lactalbumin
Biopiracy, Biopatents & GEAC
GMOs raise biosafety, ethical and ownership concerns that need regulation.
GEAC = Genetic Engineering Approval Committee (India).
- GEAC approves GM research and safety of GMO release in India
- Biopatent: a patent on a biological entity, product or process
- Biopiracy: using bio-resources/knowledge without authorisation or payment
📝 Practice Biotechnology and its Applications — 10 NEET PYQs
Real previous-year questions · with answers & solutions
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- Biotechnology Principles and Processes Class 12 Notes
- Microbes in Human Welfare Class 12 Notes
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Frequently Asked Questions
It is the applied side of biotechnology, where genetically engineered organisms and enzymes are used to make useful products for agriculture, medicine and industry. Major examples include Bt cotton, golden rice, recombinant insulin, gene therapy and transgenic animals.
Bacillus thuringiensis makes the toxin as an inactive crystal protoxin, so the bacterium itself is safe. When an insect eats it, the alkaline pH of the insect gut solubilises and activates the toxin, which binds the midgut epithelium, creates pores and lyses the cells, killing the insect.
RNA interference silences a specific pest gene by using a complementary double-stranded RNA that blocks translation of that mRNA, as used against the nematode Meloidogyne incognita in tobacco. The Bt strategy instead inserts a cry gene so the plant makes a Cry protein toxin that physically destroys the insect gut, as in Bt cotton.
Mature human insulin has an A chain of 21 amino acids and a B chain of 30 amino acids joined by disulphide bridges. In 1983 Eli Lilly produced the two chains separately in E. coli using recombinant DNA technology and then joined them, avoiding the allergy risk of animal-derived insulin.
Yes, it is part of the NEET Class 12 Biology syllabus and usually contributes about 1 to 2 questions per paper. It is scoring because most questions are direct fact recall on Bt toxin, golden rice, RNAi, Humulin, ADA deficiency gene therapy, Rosie the transgenic cow and GEAC.