Biotechnology And Its Applications Revision Notes for Biology NEET

Biotechnology is the use of living systems and organisms to develop products or modify processes for specific purposes. The field combines biology and technology, and plays a pivotal role in agriculture, medicine, industry, and research. This chapter explains the key principles, processes, and applications of biotechnology, which are critical for understanding its real-world impact in health and agriculture, as well as various ethical and safety concerns.

Principles and Processes of Biotechnology: Genetic Engineering and Recombinant DNA Technology The foundation of biotechnology lies in two main principles: using biological systems or organisms for product formation and controlling genetic changes at the molecular level. Genetic engineering—or recombinant DNA technology—is a central technique in modern biotechnology. It involves isolating DNA from an organism, modifying or combining it with DNA from another source, and transferring it into a host cell, where the new gene combination can express a desired trait.

Steps in recombinant DNA technology include identification and isolation of the gene of interest, insertion into a suitable vector (like plasmids or bacteriophages), transfer into a host organism (such as bacteria), selection of successfully modified cells, and expression of the introduced gene. Enzymes play a crucial role, especially restriction enzymes (cut DNA at specific sites) and DNA ligase (joins DNA fragments). Vectors are DNA molecules that carry foreign DNA into host cells. Common vectors include plasmids and bacteriophages.

Applications of Biotechnology in Health Biotechnology has revolutionised healthcare. One major achievement is the production of human insulin by recombinant DNA technology. Previously, insulin used for treating diabetes was extracted from animal pancreas, which sometimes caused allergic reactions. Now, the gene for human insulin is introduced into bacteria, which then produce insulin identical to the natural human form. Brands such as Humulin are examples of recombinant insulin used globally.

Vaccines can now be produced with better safety and efficiency using biotechnological tools. For example, the hepatitis B vaccine is produced by introducing the gene coding for the surface antigen of the virus into yeast cells. The yeast then expresses the antigen, which is purified and used as a vaccine.

Gene therapy is a promising application, aiming to treat genetic disorders by introducing correct copies of genes into a patient’s cells. For example, Severe Combined Immunodeficiency (SCID) can be treated by transferring the functional adenosine deaminase (ADA) gene into lymphocytes of affected children.

Applications of Biotechnology in Agriculture Biotechnology is widely used to improve crops and livestock. Genetically modified organisms (GMOs) are organisms whose genetic material has been altered using genetic engineering techniques.

Bt crops are an example of GMOs in agriculture. Bt cotton is developed by introducing a gene from the bacterium Bacillus thuringiensis, which produces a protein toxic to specific pests (mainly bollworm). This reduces the need for chemical pesticides and increases crop yield.

Other examples include Golden Rice, which is genetically engineered to produce beta-carotene, a precursor of vitamin A, to combat vitamin A deficiency; and pest- and disease-resistant plants to reduce crop losses.

Transgenic animals are produced by introducing foreign genes into their DNA. These animals are used for research purposes, as models for human diseases, or to produce useful biological products. For example, transgenic cows may be engineered to produce milk containing human proteins for pharmaceutical purposes.

• Bt crops, like Bt cotton and Bt brinjal, are resistant to insect pests thanks to Bt toxin gene insertion.
• Transgenic animals can be designed to improve milk yield, disease resistance, or to act as bioreactors for producing pharmaceuticals.
• Genetic modifications also help in developing crops with better nutritional quality.

Biosafety Issues, Biopiracy, and Patents The use of biotechnology raises important biosafety issues. GMOs can potentially cause ecological harm, allergenicity, and unintended gene transfer to other species. Therefore, strict regulations are enforced to ensure their safe use. In India, the Genetic Engineering Appraisal Committee (GEAC) oversees and approves large-scale use of GMOs.

Biopiracy is the commercial exploitation of biological resources or traditional knowledge without proper authorization or compensation to the original holders. Examples include the use of neem, turmeric, and basmati rice—plant varieties whose properties were patented by foreign companies, prompting legal battles. Many countries, including India, are working to protect their biodiversity through patent laws and international agreements.

A patent gives the inventor exclusive rights to use a process or product for a certain period. Patenting genes, crops, or biotechnology processes is controversial, as it may hinder access for farmers or researchers. International treaties like the Convention on Biological Diversity (CBD) help regulate access and benefit-sharing related to genetic resources.

Table: Examples of Biotechnology Applications

Application	Example	Organism/Process
Medicine	Insulin production	Recombinant E. coli
Agriculture	Bolt-resistant cotton	Bacillus thuringiensis gene
Medicine	Hepatitis B vaccine	Recombinant yeast
Research	Transgenic mouse	Inserted human gene

Summary of Key Points

• Biotechnology uses biological principles for product formation and genetic manipulation.
• Recombinant DNA technology is widely used to introduce desired genes.
• Human insulin and vaccines are produced through genetically engineered organisms.
• Bt crops and transgenic animals are key examples of agricultural biotechnology.
• Strict biosafety measures and patent laws help prevent risks and biopiracy.

NEET Biology Revision Notes – Biotechnology And Its Applications: Complete Guide

Mastering Biotechnology And Its Applications is vital for NEET Biology. These notes cover fundamental topics like genetic engineering, transgenic animals, and biosafety, equipping you for crucial exam questions. They’re designed to help you revise efficiently and understand real-world applications with clarity.

Summarized concepts on recombinant DNA technology, GMOs, and medical biotechnology in this guide streamline your last-minute preparation. With structured pointers and relevant examples, students can quickly recall, practice, and perform better in the NEET Biology exam.