Class 12 Biology - KERALA
Biotechnology: Principles and Processes
The chapter 'Biotechnology: Principles and Processes' in Class 12 Biology (Kerala SCERT) introduces students to the fundamental techniques of genetic engineering. It covers the core tools of recombinant DNA technology, including restriction enzymes, cloning vectors, and competent hosts, as well as the sequential processes involved in creating genetically modified organisms. Understanding this chapter is crucial for board exams as it forms the foundation for applications in medicine and agriculture. Scoring high here requires a clear grasp of enzyme actions, plasmid features, and separation techniques like gel electrophoresis and PCR.
Start Learning FreeKey Concepts
Restriction Endonucleases
Molecular scissors that cut DNA at specific recognition sequences, creating sticky or blunt ends essential for inserting foreign DNA.
Cloning Vectors
DNA molecules (like plasmids or bacteriophages) used to carry foreign genetic material into another cell for replication or expression.
Polymerase Chain Reaction (PCR)
An in vitro technique used to amplify a specific segment of DNA rapidly through repeated cycles of denaturation, annealing, and extension.
Gel Electrophoresis
A laboratory method that separates DNA fragments based on their size and electrical charge by passing them through an agarose gel.
Bioreactors
Large fermentation vessels used to grow cells or microorganisms under optimal conditions to produce large quantities of a desired biotech product.
Important Formulas
Board Exam Info
In the Kerala (SCERT) Class 12 Biology board exams, this chapter typically carries around 6 to 8 marks. Questions often include direct 2-mark definitions (like functions of plasmids or restriction enzymes), 3-mark process descriptions (steps of PCR or rDNA technology), and 5-mark diagram-based questions (such as a typical pBR322 vector or a stirred-tank bioreactor).
Frequently Asked Questions
What is the difference between exonucleases and endonucleases?
Exonucleases remove nucleotides from the ends of DNA strands, whereas endonucleases make cuts at specific internal positions within the DNA sequence.
Why is Agrobacterium tumefaciens used as a natural genetic engineer?
It naturally infects plants and transfers a piece of DNA (T-DNA) to transform normal plant cells into tumor cells to produce chemicals the bacteria need, making it a useful vector for plant genetic engineering after disarming.
What is insertional inactivation?
A method used to select recombinant colonies by inserting a recombinant DNA into the coding sequence of an enzyme (like beta-galactosidase), rendering the enzyme inactive and changing the colony color.
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