Case Study:

Biotechnology has transformed modern medicine by enabling scientists to produce important drugs, vaccines, and therapeutic proteins using living organisms. One of the most widely known examples is the production of human insulin using recombinant DNA technology.

In India, millions of people suffer from diabetes, a condition in which the body cannot produce sufficient insulin to regulate blood sugar levels. Earlier, insulin used for treatment was extracted from the pancreas of pigs and cows. However, this method sometimes caused allergic reactions and limited supply.

With advancements in biotechnology, scientists developed a method to produce recombinant human insulin. In this process, the gene responsible for producing insulin is inserted into bacterial DNA using plasmids. The genetically modified bacteria then act like “mini factories” and produce insulin in large quantities. 

The insulin produced by bacteria is collected, purified, and used in medicines. This technology made insulin safer, more affordable, and available to millions of patients worldwide. The first recombinant insulin product was introduced in 1982 and became the first biotechnology-based drug used for medical treatment.

In India, hospitals and pharmaceutical companies now rely heavily on biotechnology-based medicines such as insulin, vaccines, and monoclonal antibodies. These innovations help doctors treat diseases more effectively and reduce the dependence on animal-derived drugs.

Through this case study, students analyze how biotechnology applications in medicine help solve real healthcare problems and improve the quality of life for patients.

Questions:

Section A - MCQs

1. Why did scientists start producing insulin using recombinant DNA technology instead of extracting it from animals?
A. Animal insulin had no medical use
B. Recombinant insulin can be produced in larger quantities and is safer
C. Bacteria cannot produce proteins
D. Animal insulin was cheaper to produce

2. In recombinant insulin production, bacteria are used mainly because they:
A. Destroy insulin molecules
B. Act as living factories to produce the hormone
C. Convert insulin into glucose
D. Replace human pancreatic cells

3. If a bacterial cell receives the insulin gene through a plasmid, what is the most likely result?
A. The bacterium dies immediately
B. The bacterium begins producing insulin protein
C. The bacterium becomes a virus
D. The bacterium loses its DNA

4. Which of the following best explains why biotechnology medicines are considered more reliable?
A. They are produced randomly in laboratories
B. They are extracted only from animals
C. They are produced using controlled genetic techniques
D. They do not require purification

Section B - Short Answer Questions

1. Explain how bacteria help produce human insulin using recombinant DNA technology. (2–3 marks)

2. State two advantages of recombinant insulin over insulin obtained from animals. (2–3 marks)

3. Why is biotechnology considered important for modern healthcare systems? Give two reasons. (2–3 marks)

Section C - Long Answer Question

1. A biotechnology company plans to produce a vaccine using genetically modified microorganisms.

Explain how biotechnology can help produce vaccines safely and efficiently. Also discuss how such technology can benefit large populations in countries like India. 

Answer Key:

MCQ Answers:

1. B
2. B
3. B
4. C

Section B Answers:

1. Role of bacteria in insulin production

• Scientists insert the human insulin gene into a bacterial plasmid.
• The plasmid enters bacterial cells.
• As bacteria grow and divide, they produce insulin protein.
• The insulin is then extracted and purified for medical use.

2. Advantages of recombinant insulin

• It is chemically identical to human insulin, reducing allergic reactions.
• It can be produced in large quantities quickly and efficiently.

3. Importance of biotechnology in healthcare

• Enables large-scale production of medicines such as insulin and vaccines.
• Helps develop safer and more effective treatments for diseases.

Section C Answer 

Biotechnology helps produce vaccines using genetically modified microorganisms.

Process:

1. Scientists identify the gene responsible for producing a pathogen’s antigen.
2. The gene is inserted into microorganisms such as bacteria or yeast.
3. These organisms produce the antigen protein in large quantities.
4. The antigen is purified and used to prepare vaccines.

Benefits:

• Large-scale vaccine production for populations.
• Safer vaccines because only specific proteins are used.
• Faster development during disease outbreaks.
• Cost-effective production for countries like India with large populations.