Class 12 Biology - ODISHA
Biotechnology: Principles and Processes
The chapter 'Biotechnology: Principles and Processes' in Class 12 Biology introduces students to the foundational techniques of modern biotechnology. It covers the core techniques of genetic engineering, specifically the creation of recombinant DNA, use of restriction enzymes, cloning vectors, and host organisms. Students also learn about the processes involved in recombinant DNA technology, such as PCR, gel electrophoresis, and downstream processing. For the Odisha BSE board exams, this chapter is crucial as it forms the basis for understanding practical applications in medicine and agriculture, frequently featuring high-weightage direct theory and process-based questions.
Start Learning FreeKey Concepts
Restriction Enzymes
Molecular scissors that cut DNA at specific recognition sequences, categorized into exonucleases and endonucleases.
Cloning Vectors
DNA molecules like plasmids and bacteriophages used to carry foreign genetic material into another cell for replication.
Polymerase Chain Reaction (PCR)
An in vitro technique used to amplify a specific segment of DNA, generating millions of copies in a short time.
Gel Electrophoresis
A technique used to separate DNA fragments based on their size and charge by passing an electric field through an agarose gel.
Downstream Processing
The final stage of biotechnology involving the separation and purification of products before commercialization.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 12 Biology board exam, this chapter typically carries around 6 to 8 marks. Questions frequently include 2-mark short notes on restriction enzymes or plasmids, 3-mark process explanations like PCR or gel electrophoresis, and occasionally long-answer questions detailing the steps of recombinant DNA technology.
Frequently Asked Questions
What is the difference between restriction exonucleases and endonucleases?
Exonucleases remove nucleotides from the ends of DNA strands, whereas endonucleases cut DNA at specific internal positions away from the ends.
Why is Taq polymerase used in PCR?
Taq polymerase is extracted from a thermophilic bacterium (Thermus aquaticus), allowing it to withstand the high denaturation temperatures required during PCR without denaturing.
What is the role of selectable markers in cloning vectors?
Selectable markers help in identifying and eliminating non-transformants and selectively permitting the growth of the transformants.
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