Class 12 Biology - GUJARAT
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. GSEB Class 12 students will learn about genetically modified organisms like Bt cotton, the production of human insulin using bacteria, gene therapy for treating hereditary diseases, and molecular diagnostics. This chapter is exceptionally high-scoring and crucial for board exams, frequently featuring direct theoretical questions, diagram-based questions on RNA interference, and conceptual problems related to biopiracy and ethical issues.
Start Learning FreeKey Concepts
Bt Cotton
A pest-resistant transgenic crop created by introducing a cry gene from the bacterium Bacillus thuringiensis, which produces a crystal protein toxic to bollworms.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes that uses double-stranded RNA to silence specific messenger RNAs, used to protect tobacco plants from nematode infection.
Genetically Engineered Insulin
Human insulin (Humulin) produced by inserting human insulin gene chains A and B into plasmid vectors of E. coli to treat diabetes effectively without allergic reactions.
Gene Therapy
A medical technique that corrects defective genes responsible for hereditary diseases, famously demonstrated by treating Adenosine Deaminase (ADA) deficiency.
Molecular Diagnostics
Early detection methods like PCR, ELISA, and recombinant DNA probes that identify pathogens or genetic disorders before clinical symptoms appear.
Biopiracy and Biopatents
The unauthorized extraction and commercial exploitation of biological resources and traditional knowledge of indigenous communities without proper compensation.
Important Formulas
Board Exam Info
In the Gujarat (GSEB) Class 12 Biology board exam, this chapter typically carries around 4 to 6 marks. Questions usually include a mix of 1-mark objective questions, 2-mark short notes (e.g., Bt cotton, Gene therapy), and 3-mark conceptual or process-based questions explaining medical or agricultural applications.
Frequently Asked Questions
Why doesn't the Bt toxin kill the Bacillus thuringiensis bacterium itself?
The toxin exists in the bacterium as an inactive protoxin form, which only becomes active when exposed to the alkaline pH of the insect gut.
What is the difference between chain A and chain B of insulin?
Naturally, human insulin is synthesized as a pro-hormone containing an extra C-peptide. In E. coli, chains A and B are produced separately and then joined together by disulfide bonds.
What is the role of adenosine deaminase (ADA) in the body?
ADA is crucial for the proper functioning of the immune system. Its deficiency leads to Severe Combined Immunodeficiency (SCID).
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