Which of the following is a method used to treat adenosine deaminase (ADA) deficiency through gene therapy?

Insertion of functional ADA gene using a retroviral vector

What is the role of transgenic animals in chemical safety testing?

They are made more sensitive to toxic substances to study the effects of toxicity.

They are used to detoxify harmful chemicals in the environment.

They are used to test the nutritional value of chemicals.

They are made more sensitive to toxic substances to study the effects of toxicity.

They are used to replace chemical testing in plants.

What is the primary purpose of producing transgenic animals that express human proteins like α-1-antitrypsin?

To produce biological products for treating human diseases

To improve animal resistance to diseases

To produce biological products for treating human diseases

How does ELISA detect the presence of a pathogen?

By detecting antibodies or antigens

By hybridizing DNA/RNA with a radioactive probe

By sequencing the pathogen's genome

In the context of RNA interference (RNAi) in transgenic plants, what is the significance of double-stranded RNA (dsRNA)?

It triggers the degradation of specific mRNA, preventing protein synthesis

It acts as a nutrient source for the plant

It triggers the degradation of specific mRNA, preventing protein synthesis

It enhances the plant's photosynthetic efficiency

It acts as a structural component in plant cell walls

Why was the production of genetically engineered insulin significant in 1983?

It provided an abundant supply of insulin without causing allergic reactions

It eliminated the need for insulin injections

It provided an abundant supply of insulin without causing allergic reactions

It allowed insulin to be administered orally

It replaced the need for any diabetes medication

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Class 12 Science (PCB)

Biology

Biotechnology and its Applications

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Biological Products from Transgenic Animals

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Biopiracy and Intellectual Property

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Biotechnological Applications in Agriculture

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Learning Objectives

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Learning Objectives

Understand the applications of biotechnology in agriculture and medicine.
Explain the concept of transgenic organisms and provide examples.
Compare and contrast the advantages and disadvantages of genetically modified crops.
Describe the process and significance of gene therapy, particularly for ADA deficiency.
Illustrate the experimental steps involved in cloning and expressing human genes in bacteria.
Discuss the ethical issues surrounding genetic modification and biotechnology.

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Revision Notes & Summary

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Biotechnology and Its Applications

10.1 Biotechnological Applications in Agriculture

Biotechnology involves the industrial-scale production of biopharmaceuticals and biologicals using genetically modified organisms.
Key areas of biotechnology include:
- Improved catalysts (microbes or enzymes)
- Optimal conditions for catalysts
- Downstream processing technologies for purification

10.2 Biotechnological Applications in Medicine

Techniques such as recombinant DNA technology, PCR, and ELISA are crucial for early diagnosis of diseases.
Gene Therapy: Involves inserting genes into cells to treat hereditary diseases. Example: Adenosine deaminase (ADA) deficiency.

10.3 Transgenic Animals

Transgenic animals have altered DNA to express foreign genes. Commonly used for:
- Studying normal physiology and development
- Understanding disease mechanisms (e.g., cancer, cystic fibrosis)

10.4 Ethical Issues

The manipulation of genetic material raises ethical concerns regarding biopiracy and the exploitation of bio-resources without proper compensation.

Important Concepts

Cry Proteins: Proteins produced by certain bacteria that are used in pest-resistant crops.
Gene Therapy Example: The first clinical gene therapy was for ADA deficiency in a 4-year-old girl.
Molecular Diagnosis: Early detection of pathogens using techniques like PCR and ELISA.

Applications of Tissue Culture

Tissue culture allows for the regeneration of whole plants from explants, leading to micro-propagation of genetically identical plants.
This method is used to recover healthy plants from diseased ones by culturing meristems.

Summary of Key Techniques

Recombinant DNA Technology: Enables the production of genetically modified organisms (GMOs) for improved crop yields and healthcare solutions.
PCR: A technique to amplify DNA, allowing for the detection of low concentrations of pathogens.
ELISA: Used for detecting antigens or antibodies related to infections.

Diagram Descriptions

Insulin Production: Illustrates the conversion of proinsulin to insulin, highlighting the role of disulfide bonds.
Root Systems: Comparison of root systems with and without nodules, indicating the presence of beneficial bacteria.

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Practice Test – MCQs, True/False

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Multiple Choice Questions

Rosie the cow; used for producing insulin

Rosie the cow; used for producing alpha-lactalbumin

Dolly the sheep; used for producing alpha-lactalbumin

Dolly the sheep; used for producing insulin

Correct Answer: B

Solution:

Rosie was the first transgenic cow that produced human protein-enriched milk containing alpha-lactalbumin, which is more nutritionally balanced for human babies.

Chapter Concept:

Transgenic Animals

The bacteria are resistant to the toxin.

The toxin is inactive in the bacteria.

The bacteria enclose the toxin in a special sac.

The bacteria produce an antidote to the toxin.

Correct Answer: B

Solution:

Bt toxins are produced as inactive protoxins in Bacillus thuringiensis, which do not affect the bacteria.

Chapter Concept:

Bt Toxin and Pest Resistance

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Biotechnology and its Applications

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True or False

Correct Answer: True

Solution:

Biopiracy involves exploiting bio-resources and traditional knowledge without proper authorization or compensation, as outlined in the provided excerpts.

Chapter Concept :

Biopiracy and Intellectual Property

Correct Answer: True

Solution:

The GEAC is indeed tasked with evaluating the validity of GM research and ensuring the safety of introducing GM organisms for public services, as stated in the text.

Chapter Concept :

Ethical Issues in Biotechnology

Correct Answer: True

Solution:

Micro-propagation involves the use of tissue culture techniques to produce a large number of plants that are genetically identical to the original plant, known as somaclones.

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The Redemption Arena

Biotechnology and its Applications

Study Action Plan (Sorted by Difficulty)

Biological Products from Transgenic Animals

High

Biopiracy and Intellectual Property

High

Biotechnological Applications in Agriculture

Learning Objectives

Learning Objectives

Practice, Analyze & Improve 🚀

Revision Notes & Summary

Biotechnology and Its Applications

10.1 Biotechnological Applications in Agriculture

10.2 Biotechnological Applications in Medicine

10.3 Transgenic Animals

10.4 Ethical Issues

Important Concepts

Applications of Tissue Culture

Summary of Key Techniques

Diagram Descriptions

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Practice Test – MCQs, True/False

Multiple Choice Questions

Q1.Which of the following transgenic animals was the first to produce human protein-enriched milk, and what was the protein used for?

Correct Answer: B

Q2.Why do Bt toxins not affect Bacillus thuringiensis itself?

Correct Answer: B

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True or False

Q1.Biopiracy refers to the unauthorized use of bio-resources and traditional knowledge without proper compensation.

Correct Answer: True

Q2.The Genetic Engineering Approval Committee (GEAC) is responsible for making decisions regarding the validity of GM research and the safety of introducing GM organisms for public services.

Correct Answer: True

Q3.Micro-propagation is a method used to produce genetically identical plants from a single explant.

Correct Answer: True

High

Bt Toxin and Pest Resistance

High

Core Scope and Research Areas of Biotechnology

High

Ethical Issues in Biotechnology

High

Gene Therapy and ADA Deficiency

High

Genetically Engineered Insulin

High

Genetically Modified Organisms (GMOs)

High

Molecular Diagnosis Techniques

High

Recombinant DNA Technology in Medicine

High

RNA Interference in Pest-Resistant Plants

High

Transgenic Animals

High

Q3.Which of the following is a method used to treat adenosine deaminase (ADA) deficiency through gene therapy?

Correct Answer: C

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Q4.What is the role of transgenic animals in chemical safety testing?

Correct Answer: C

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Q5.What is the primary purpose of producing transgenic animals that express human proteins like α-1-antitrypsin?

Correct Answer: C

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Q6.How does ELISA detect the presence of a pathogen?

Correct Answer: B

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Q7.In the context of biotechnology applications, which process is used to achieve virus-free plants?