Science Biology Notes | Class 12 – Chapter 9: Biotechnology : Principles and Processes

You will get here Science Biology class 12 CBSE notes Chapter 9: Biotechnology : Principles and Processes. You can connect with us for every important update related to class 12.

Science Biology is a very important subject for you because it will help you increase your percentage as well as it is an important subject for your medical entrance exam. You can score high marks in this subject by studying notes and practicing MCQs. In this post, we will cover Chapter 9: Biotechnology : Principles and Processes.

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Key Content Of Chapter 9 Biotechnology : Principles and Processes

👉 Biotechnology : Principles and Processes is mainly about genetic engineering + tools + stepwise production of useful biological products on a large scale.

🌍 1. Introduction to Biotechnology

• Biotechnology = use of living organisms, cells, or enzymes to make useful products.
• Includes both:
  • Traditional biotechnology (curd, bread, wine)
  • Modern biotechnology (genetic engineering, DNA technology)
• Focus is on large-scale production + human benefit

🧬 2. Principles of Biotechnology

Two main principles:

⚙️ (i) Genetic Engineering

• Direct manipulation of DNA
• Involves:
  • Cutting DNA
  • Joining DNA
  • Transferring genes
• Used to create recombinant DNA (rDNA)

🧫 (ii) Bioprocess Engineering

• Large-scale production under controlled & sterile conditions
• Used in making:
  • Vaccines
  • Antibiotics
  • Enzymes

🔑 3. Core Concept: Recombinant DNA Technology

• Combines DNA from different sources
• Enables organisms to produce desired traits/products

Basic Steps:

1. Identify gene of interest
2. Isolate DNA
3. Insert into vector
4. Transfer into host
5. Expression of gene

🧰 4. Tools of Recombinant DNA Technology

✂️ Restriction Enzymes

• Cut DNA at specific sequences (palindromes)
• Called molecular scissors
• Create sticky ends

🧵 DNA Ligase

• Joins DNA fragments → forms recombinant DNA

🚚 Vectors

• Carry DNA into host
• Examples:
  • Plasmids
  • Bacteriophages

Important Features:

• Origin of replication (ori)
• Selectable markers (antibiotic resistance)
• Cloning sites

🧫 5. Competent Host Cells

• Cells modified to take up DNA
• Methods:
  • Calcium ion treatment
  • Heat shock
  • Microinjection
  • Gene gun
  • Disarmed pathogens

🔄 6. Processes of Recombinant DNA Technology

🧪 (i) Isolation of DNA

• Break cells → release DNA
• Remove RNA, proteins → pure DNA

✂️ (ii) Cutting of DNA

• Using restriction enzymes
• Checked by gel electrophoresis

🔁 (iii) PCR (Polymerase Chain Reaction)

• Amplifies DNA → millions/billions of copies
• Steps:
  1. Denaturation
  2. Annealing
  3. Extension

📥 (iv) Insertion into Host

• Recombinant DNA introduced into host cell
• Selection using antibiotic resistance markers

🧬 (v) Expression of Gene Product

• Host produces desired protein
• Called recombinant protein

🏭 7. Bioreactors

• Large vessels for industrial production
• Maintain:
  • Temperature
  • pH
  • Oxygen supply
• Types:
  • Stirred tank bioreactor

📦 8. Downstream Processing

• Final processing of product
• Includes:
  • Separation
  • Purification
  • Quality control
• Product becomes ready for market use

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Class 12 Science Biology Chapter 9: Biotechnology : Principles and Processes Notes

Class 12 Biology Chapter 9 Biotechnology : Principles and Processes MCQs

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FAQs About Biotechnology : Principles and Processes