Class 12 Biology - BIHAR
Biotechnology: Principles and Processes
The chapter 'Biotechnology: Principles and Processes' in Class 12 Biology introduces students to the core techniques of modern biotechnology, specifically genetic engineering and bioprocess engineering. Students learn how recombinant DNA is created, the tools used such as restriction enzymes, vectors, and host organisms, and the processes involved in large-scale production like bioreactors. This chapter is exceptionally high-scoring and vital for the Bihar (BSEB) board exams, frequently featuring descriptive questions on the steps of rDNA technology, naming conventions of restriction enzymes, and plasmid characteristics.
Start Learning FreeKey Concepts
Principles of Biotechnology
Involves genetic engineering (altering the chemistry of genetic material) and bioprocess engineering (maintaining sterile conditions for growth of only desired microbes/eukaryotic cells).
Restriction Enzymes (Molecular Scissors)
Endonucleases that cut DNA at specific recognition sequences, producing sticky or blunt ends essential for joining foreign DNA to vectors.
Cloning Vectors
DNA molecules like plasmids and bacteriophages used to carry foreign genetic material into another cell, possessing an origin of replication, selectable markers, and cloning sites.
Gel Electrophoresis
A technique used to separate DNA fragments based on their size and charge by passing an electric field through an agarose gel matrix.
Bioreactors
Large vessel systems where raw materials are biologically converted into specific products using microbial, plant, or animal cells under optimized conditions.
Important Formulas
Board Exam Info
In the Bihar (BSEB) Class 12 Biology board exam, this chapter typically carries around 5 to 7 marks. Questions frequently include short-answer questions on restriction enzymes and plasmids, and long-answer questions detailing the steps of Recombinant DNA Technology or PCR.
Frequently Asked Questions
What is the difference between exonuclease and endonuclease?
Exonucleases remove nucleotides from the ends of DNA strands, whereas endonucleases cut DNA at specific internal positions.
Why is the enzyme Taq polymerase used in PCR?
Taq polymerase is isolated from a thermophilic bacterium (Thermus aquaticus) and remains stable at high temperatures used during the denaturation step of PCR.
What is the role of a selectable marker in cloning vectors?
It helps in identifying and eliminating non-transformants and selectively permitting the growth of transformants (cells that have taken up the recombinant vector).
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