Class 12 Biology - PUNJAB
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how genetic engineering and recombinant DNA technology are practically used in agriculture, medicine, and industry. Punjab (PSEB) Class 12 students will learn about genetically modified organisms (GMOs) like Bt cotton, the production of human insulin using bacteria, gene therapy for treating genetic disorders, and molecular diagnostics. Ethical issues such as biopiracy and biowarfare are also covered. This chapter is exceptionally important for board exams as it features both conceptual direct questions and application-based case studies, making it a high-scoring section if diagrams and process steps are clearly understood.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified pest-resistant crop created by introducing a crystal protein gene (cry gene) from the bacterium Bacillus thuringiensis, which kills cotton bollworms.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes used to silence specific mRNA using complementary dsRNA, famously applied in developing nematode-resistant tobacco plants.
Genetically Engineered Insulin (Humulin)
Human insulin produced commercially by inserting human insulin gene chains A and B into plasmid vectors of E. coli bacteria to treat diabetes mellitus.
Gene Therapy
A medical technique that corrects defective genes responsible for hereditary diseases, such as introducing a functional ADA gene into lymphocytes for ADA deficiency patients.
Biopiracy
The unauthorized commercial use of biological resources and traditional knowledge from developing countries by multinational companies without proper compensation or permission.
Important Formulas
Board Exam Info
In the Punjab (PSEB) Class 12 Biology board exam, this chapter typically carries around 4 to 6 marks. Common question types include short answer questions on applications of biotech in agriculture and medicine, difference-based questions like transgenic animals vs normal animals, and long answer questions explaining the production of recombinant insulin or gene therapy.
Frequently Asked Questions
How does Bt toxin not kill the bacterium Bacillus thuringiensis itself?
The Bt toxin exists as an inactive protoxin inside the bacterium. It only becomes active and toxic when it encounters the alkaline pH of the insect's gut, which solubilizes the crystals.
What is the difference between gene therapy and molecular diagnosis?
Gene therapy involves replacing or repairing defective genes to treat a disease, whereas molecular diagnosis refers to early detection of diseases using techniques like PCR and ELISA before symptoms appear.
Why was the insertion of the human insulin gene into E. coli challenging?
Human insulin is synthesized as a pro-hormone containing an extra C-peptide which is removed during maturation. Scientists had to separately synthesize DNA sequences for chains A and B and link them together in E. coli.
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