Class 12 Biology - BIHAR
Biotechnology and its Applications
The chapter 'Biotechnology and its Applications' explores how genetic engineering and biological processes are used to solve human problems in agriculture, medicine, and industry. For Class 12 Bihar Board (BSEB) students, this chapter is high-scoring and practically relevant. It covers major breakthroughs like Genetically Modified Organisms (GMOs) such as Bt cotton, biopesticides, therapeutic products like recombinant insulin, gene therapy, and molecular diagnostics. Board exams frequently test your understanding of practical applications, specific examples like RNA interference (RNAi), and ethical issues surrounding biotechnology such as biopiracy and patents. Mastering this chapter ensures confidence in both objective and descriptive questions.
Start Learning FreeKey Concepts
Bt Cotton
A genetically modified cotton variety containing a crystal protein gene (cry genes) derived from the bacterium Bacillus thuringiensis, which protects the plant against bollworms without needing chemical insecticides.
RNA Interference (RNAi)
A cellular defense mechanism in eukaryotes that uses gene silencing via double-stranded RNA to protect plant roots, such as tobacco plants, from parasitic nematodes like Meloidegyne incognita.
Genetically Engineered Insulin (Humulin)
Human insulin produced commercially by inserting human insulin gene chains A and B into plasmid vectors of E. coli bacteria, overcoming the limitations of animal-derived insulin allergies.
Gene Therapy
An experimental technique that corrects defective genes to treat genetic disorders, famously applied to treat Adenosine Deaminase (ADA) deficiency by introducing functional ADA cDNA into lymphocytes.
Molecular Diagnostics
Advanced diagnostic techniques like PCR (Polymerase Chain Reaction) and ELISA (Enzyme-Linked Immunosorbent Assay) that detect pathogens and genetic disorders at an early stage before clinical symptoms appear.
Important Formulas
Board Exam Info
In the Bihar Board (BSEB) Class 12 Biology examination, this chapter typically carries around 4 to 6 marks. Questions frequently include short-answer questions (SAQs) on Bt cotton, gene therapy, or ELISA, and objective multiple-choice questions (MCQs) regarding transgenic animals, biopiracy, and insulin production.
Frequently Asked Questions
What is the difference between Bt toxin and Bt cotton?
Bt toxin is the insecticidal protein produced by the bacterium Bacillus thuringiensis, whereas Bt cotton is the transgenic crop plant that has been genetically engineered to express this bacterial toxin gene.
Why is ADA deficiency not completely cured by bone marrow transplantation?
While bone marrow transplantation and enzyme replacement therapy can help, they are not permanent cures because the introduced cells are not immortal and regular treatments or gene-corrected embryonic stem cells are required.
What is biopiracy?
Biopiracy is the unauthorized appropriation and commercial exploitation of biological resources and traditional knowledge from indigenous communities by multinational corporations without proper compensation or permission.
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