Question 1

What do you understand by the term 'Biotechnology'? Explain giving suitable examples.

Accepted Answer

Biotechnology is the use of living organisms, cells, and biological systems to develop products and technologies for human benefit. It involves manipulating biological processes for industrial, medical, agricultural, and environmental applications. Examples include the production of antibiotics, genetically modified crops, fermentation for alcohol production, and gene therapy. — The term 'Biotechnology' combines 'bio' meaning life and 'technology' meaning the application of scientific knowledge. Ancient biotechnology included fermentation to make bread and alcohol, while modern biotechnology uses genetic engineering and recombinant DNA technology to create improved products and therapies.

Question 2

Give a comparative account of the ancient and modern concept of biotechnology.

Accepted Answer

Ancient biotechnology involved traditional practices using microorganisms and biological processes without understanding the underlying science. Examples include fermentation for making bread, cheese, and alcohol, and selective breeding of plants and animals. Modern biotechnology is based on molecular biology and genetic engineering, involving recombinant DNA technology to manipulate genes precisely for desired traits, such as genetically modified crops, gene therapy, and biopharmaceuticals. — Ancient biotechnology was empirical and based on observation, while modern biotechnology uses scientific knowledge and tools like gene cloning, PCR, and genome editing. The scope and precision of modern biotechnology are far greater, enabling targeted improvements and novel products.

Question 3

Elaborate on the role of biotechnology with respect to the following:
(a) Biopharmaceutical production
(b) Gene therapy and applications
(c) Abiotic stress resistance in crops
(d) Crops with insect resistance
(e) Environmental protection and conservation

Accepted Answer

(a) Biopharmaceutical production: Biotechnology enables the production of medicines like insulin, vaccines, and monoclonal antibodies using genetically engineered microorganisms or cell cultures.

(b) Gene therapy and applications: It involves correcting defective genes responsible for disease development by inserting functional genes into patient's cells.

(c) Abiotic stress resistance in crops: Genetic engineering helps develop crops that can withstand drought, salinity, and extreme temperatures, improving yield and food security.

(d) Crops with insect resistance: Bt cotton and other genetically modified crops produce insecticidal proteins, reducing the need for chemical pesticides.

(e) Environmental protection and conservation: Biotechnology aids in bioremediation to clean pollutants, waste management, and conservation of biodiversity through cloning and gene banks. — Biotechnology provides tools to improve health, agriculture, and environment by manipulating biological systems. Each application addresses specific challenges: producing safer medicines, curing genetic diseases, enhancing crop resilience, reducing pesticide use, and restoring ecosystems.

Question 4

Explain the contribution of ancient biotechnology in human welfare.

Accepted Answer

Ancient biotechnology contributed to human welfare through practices like fermentation to produce bread, beer, and cheese, which improved nutrition and food preservation. Selective breeding of plants and animals enhanced food production. These technologies laid the foundation for modern biotechnology by utilizing natural biological processes for human benefit. — Though ancient biotechnology lacked molecular understanding, it harnessed microbes and biological processes effectively. These contributions improved diet, health, and agriculture, supporting the growth of civilizations.

Question 5

Modern biotechnology is based on recombinant DNA technology. Justify the statement.

Accepted Answer

Modern biotechnology relies on recombinant DNA technology, which involves combining DNA from different sources to create new genetic combinations. This technology allows precise manipulation of genes to develop genetically modified organisms, produce biopharmaceuticals, and perform gene therapy. It forms the basis for most advances in medicine, agriculture, and industry in modern biotechnology. — Recombinant DNA technology enables scientists to isolate, modify, and insert genes into organisms, overcoming limitations of traditional breeding. This precision and versatility justify the statement that modern biotechnology is based on recombinant DNA technology.

Question 6

Who coined the term 'Biotechnology' and in which year was it introduced?

Accepted Answer

Karl Ereky in 1917 — The term 'Biotechnology' was coined by Karl Ereky, a Hungarian scientist, in 1917 in his book describing the use of technology to transform plants and animals into useful products.

Question 7

Which of the following best defines biotechnology?

Accepted Answer

Use of living cells and biological molecules to develop useful products — Biotechnology refers to the different technologies that make use of living cells and/or biological molecules to generate useful products for the benefit of mankind.

Question 8

Describe the process and significance of fermentation in ancient biotechnology with an example.

Accepted Answer

Fermentation is a microbial process involving enzymatically controlled conversion of organic compounds. For example, in ancient times, fermentation was used to make bread and curd (dahi). In curd making, Lactobacillus bacteria convert milk protein casein into lactic acid, which coagulates the milk proteins to form curd. — Fermentation was practiced for years without knowledge of microbes. It involves microbes like yeast or bacteria converting substrates into useful products. The example of curd making illustrates microbial fermentation where Lactobacillus bacteria convert milk into curd by producing lactic acid.

Question 9

Explain the role of Louis Pasteur in the development of fermentation technology.

Accepted Answer

Louis Pasteur established that yeast and other microbes are responsible for fermentation during the 1850s and 1860s. He disproved spontaneous generation and developed pasteurisation, which improved fermentation techniques. — Pasteur's experiments showed that fermentation is caused by living microorganisms, mainly yeast. He also developed pasteurisation to kill harmful microbes, improving food safety and fermentation control.

Question 10

Identify the scientist who first observed living microorganisms in pond water and what term did he use to describe them?

Accepted Answer

Antonie van Leeuwenhoek; animalcules — Antonie van Leeuwenhoek, a Dutch shopkeeper, observed living microorganisms in pond water in 1676 and called them 'animalcules'.

Question 11

Match the following types of biotechnology with their correct application areas:

1. Blue Biotechnology
2. Green Biotechnology
3. Red Biotechnology
4. White Biotechnology

Accepted Answer

— Blue Biotechnology applies to marine and freshwater organisms for seafood and drug development; Green Biotechnology focuses on environment-friendly plant improvements; Red Biotechnology is medical biotechnology for pharmaceuticals; White Biotechnology improves industrial processes using enzymes.

Question 12

Which of the following is NOT an example of red biotechnology?

Accepted Answer

Use of enzymes as industrial catalysts for chemical production — Red biotechnology relates to medical applications like production of insulin, vaccines, and antibiotics. Use of enzymes for industrial chemical production is white biotechnology.

Question 13

Explain recombinant DNA (rDNA) technology and its significance in modern biotechnology.

Accepted Answer

(a) Recombinant DNA technology involves cutting and joining DNA fragments from different organisms to create new genetic combinations.
(b) This recombinant DNA is introduced into host organisms to express desired traits.
(c) It allows precise gene transfer, conferring novel properties to organisms.
(d) rDNA technology has revolutionized biotechnology by enabling production of therapeutic proteins, genetically modified crops, and environmental solutions.
(e) It integrates molecular biology, genetics, and microbiology to develop advanced biotechnological applications. — Recombinant DNA technology is the foundation of modern biotechnology. It enables scientists to manipulate genetic material with precision by cutting DNA from one organism and joining it with DNA from another, creating recombinant DNA. This DNA is inserted into a host organism to express new traits, such as insulin production in bacteria or pest resistance in plants. This technology has transformed medicine, agriculture, and environmental science by providing efficient and targeted solutions.

Question 14

Which of the following is a major application area of modern biotechnology?

Accepted Answer

Medicine and health care — Modern biotechnology is widely applied in medicine and health care, including diagnostics, therapeutics, and gene therapy, among other fields.

Question 15

Describe how human insulin is produced using recombinant DNA technology.

Accepted Answer

Human insulin is produced by inserting the human insulin gene into microorganisms like Escherichia coli or Saccharomyces cerevisiae using recombinant DNA technology. These microbes express the insulin protein which is then purified for medical use in diabetes treatment. — Using rDNA technology, the gene coding for human insulin is cloned into bacterial or yeast cells. These cells act as factories producing insulin identical to human insulin, providing a reliable and efficient source for diabetic patients.

Introduction

Introduction — Study Notes

An Introduction to Biotechnology

1.1 Historical Perspectives

Overview of Modern Biotechnology

Practice Questions — Introduction

All 12 Chapters in Biotechnology