Biotechnology and its Applications

The One Thing

Biotechnology applies genetic engineering and biological processes to produce useful products and services in medicine, agriculture, industry, and environmental management. Its applications must be assessed using scientific evidence, biosafety procedures, ethical principles, environmental monitoring, and fair access to benefits.

Reactions, Processes and Experiments

Key Terms

• Recombinant DNA technology: A method of joining DNA from two different sources and introducing the combined DNA into a host cell.
• Genetically modified organism: An organism whose genetic material has been deliberately altered using biotechnology.
• Transgenic organism: An organism that carries and expresses a gene introduced from another species.
• Human insulin: Insulin produced using genetically engineered microorganisms, commonly by inserting human insulin genes into bacteria.
• Proinsulin: The inactive precursor of insulin that contains an additional connecting peptide, which is removed to form functional insulin.
• Gene therapy: Treatment of a genetic disorder by correcting, replacing, or supplying a functional gene in a patient's cells.
• ADA deficiency: A genetic disorder caused by the absence or malfunction of adenosine deaminase, an enzyme important for immune-system function.
• Molecular diagnosis: Detection of diseases or genetic conditions using DNA, RNA, antibodies, or other molecular markers.
• PCR: Polymerase chain reaction, a technique used to make millions of copies of a specific DNA segment for diagnosis, research, or identification.
• ELISA: An antibody-based test used to detect specific antigens or antibodies, such as those associated with infections.
• Bt cotton: A genetically modified cotton variety containing genes from Bacillus thuringiensis that produce proteins toxic to certain insect pests.
• Cry genes: Genes from Bacillus thuringiensis that code for insecticidal crystal proteins.
• Bt toxin: A protein that becomes active in the alkaline gut of susceptible insect larvae and damages their intestinal lining.
• RNA interference: A natural or engineered process in which specific double-stranded RNA molecules silence gene expression by destroying or blocking complementary messenger RNA.
• Golden rice: A genetically modified rice variety designed to produce beta-carotene, a precursor of vitamin A, in its endosperm.
• Transgenic animal: An animal whose genome contains and expresses a foreign gene introduced through genetic engineering.
• Bioreactor: A vessel or system that provides controlled conditions for the large-scale growth of cells or microorganisms and production of biotechnology products.
• Biopharming: Production of useful pharmaceutical substances, such as proteins, through genetically modified organisms.
• GEAC: The Genetic Engineering Appraisal Committee, the Indian regulatory body responsible for assessing and approving the environmental release of genetically engineered organisms and products.
• Biopiracy: Unauthorized use or commercial exploitation of biological resources or traditional knowledge without proper permission or benefit sharing.
• Patent: A legal right granted for an invention, giving the inventor controlled use of it for a specified period.
• Bioethics: The study of moral issues related to biotechnology, including safety, consent, justice, animal welfare, and environmental protection.

Easily Confused

• Recombinant organism and transgenic organism: A recombinant organism contains DNA joined from different sources, whereas a transgenic organism specifically carries and expresses a gene introduced from another species.
• Proinsulin and mature insulin: Proinsulin contains a connecting peptide; mature human insulin consists of A and B polypeptide chains linked by disulfide bonds and lacks the connecting peptide.
• PCR and ELISA: PCR amplifies and detects specific DNA or genetic material, whereas ELISA detects specific antigens or antibodies.
• Cry genes and Bt toxin: Cry genes encode insecticidal crystal proteins, whereas Bt toxin is the protein that becomes active in the alkaline gut of susceptible insect larvae.
• Bt cotton and RNA interference: Bt cotton produces insecticidal proteins from Bacillus thuringiensis genes, whereas RNA interference silences specific pest genes using double-stranded RNA.
• Gene therapy and molecular diagnosis: Gene therapy treats the underlying genetic cause by supplying or correcting a gene, whereas molecular diagnosis detects disease or genetic material.
• Biopiracy and patenting: Biopiracy involves unauthorized exploitation without consent or benefit sharing, whereas a patent is a legal right granted for an invention.
• Bioreactor and biopharming: A bioreactor is the controlled system used for large-scale biological production, whereas biopharming is the production of pharmaceutical substances through genetically modified organisms.
• GEAC and bioethics: GEAC is an Indian regulatory body responsible for environmental-release assessment, whereas bioethics concerns the wider moral issues of biotechnology.

What Gets Asked

• Explain recombinant human insulin production: State that DNA sequences for the insulin chains are inserted into bacteria, the chains are produced separately, and they are recovered and combined. Marks are lost by describing insulin as being produced directly as mature protein without mentioning the separate chains.
• Compare proinsulin with mature insulin: Identify the connecting peptide in proinsulin and state that mature insulin contains A and B chains linked by disulfide bonds. Omitting the absence of the connecting peptide loses the distinguishing point.
• Describe ADA gene therapy: Include the introduction of functional ADA genes into lymphocytes outside the body and the return of corrected cells to the patient. Also state that repeated treatment may be required if long-term stem-cell correction is not achieved.
• Distinguish PCR from ELISA in diagnosis: PCR detects or amplifies pathogen DNA or genetic material, while ELISA detects pathogen-specific antigens or antibodies. Confusing nucleic-acid detection with antibody-based detection costs marks.
• Explain Bt cotton and RNA interference: Bt cotton uses cryIAc and cryIIAb genes to produce insecticidal proteins, while RNA interference silences specific pest genes through complementary double-stranded RNA. Treating both as the same mechanism is incorrect.
• Discuss benefits and risks of genetically modified organisms: Address improved pest resistance, nutritional quality, yield, or environmental-stress tolerance alongside gene transfer, resistant pests, effects on non-target organisms, biodiversity loss, food safety, socioeconomic dependence, and the need for regulation and long-term monitoring.