Biotechnology Principles and Processes — Class 12 Biology NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Biology chapter "Biotechnology Principles and Processes" — 8 important questions with detailed answers for CBSE board exam preparation.
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TL;DR: Free step-by-step NCERT solutions for Class 12 Biology chapter "Biotechnology Principles and Processes" — 8 important questions with detailed answers…
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Key Questions Covered:
- Define biotechnology.
- What is genetic engineering? Explain its basic steps.
- What is a restriction enzyme? How is it used in genetic engineering?
- Explain the structure and function of a plasmid as a vector in genetic engine…
- What is PCR (Polymerase Chain Reaction)? Describe its three main steps.
- What is DNA ligase? Explain its role in recombinant DNA formation.
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define biotechnology. | ✓ Solved |
| What is genetic engineering? Explain its basic steps. | ✓ Solved |
| What is a restriction enzyme? How is it used in genetic e… | ✓ Solved |
| Explain the structure and function of a plasmid as a vect… | ✓ Solved |
| What is PCR (Polymerase Chain Reaction)? Describe its thr… | ✓ Solved |
| What is DNA ligase? Explain its role in recombinant DNA f… | ✓ Solved |
Showing 6 of 8 questions
Q1: Define biotechnology.
Biotechnology is the technology that uses living cells, organisms, or their components (enzymes, DNA, proteins) to obtain useful products and services for human welfare. It integrates biology with engineering, chemistry, and medicine to develop new technologies and solve problems in agriculture, medicine, industry, and environment.
Q2: What is genetic engineering? Explain its basic steps.
Genetic engineering is the process of introducing desired genes into an organism's genome to alter its genetic makeup and create new traits. It involves manipulation of DNA to produce organisms with new characteristics.
BASIC STEPS:
1. IDENTIFICATION OF DESIRED GENE:
- Identify the trait or protein to be introduced
- Locate the source organism containing the desired gene
- Examples: Insulin gene from human, Bt toxin gene from Bacillus thuringiensis
2. GENE ISOLATION:
- Extract DNA from source...
Q3: What is a restriction enzyme? How is it used in genetic engineering?
Restriction enzymes (restriction endonucleases) are bacterial proteins that recognize and cut DNA at specific sequences called recognition sites. They are essential tools in genetic engineering.
CHARACTERISTICS:
- Recognize specific palindromic DNA sequences (4-8 base pairs)
- Cut DNA double strand at specific positions
- Produce sticky ends (cohesive) or blunt ends
- Work like 'molecular scissors'
- Each enzyme cuts at different recognition sequences
USES IN GENETIC ENGINEERING:
1. CUTTING D...
Q4: Explain the structure and function of a plasmid as a vector in genetic engineering.
A plasmid is a small, circular, double-stranded DNA molecule that exists independently of the bacterial chromosome. It is widely used as a vector in genetic engineering.
STRUCTURE:
- Circular DNA (usually 1-10 kb in size)
- Double-stranded (dsDNA)
- Exists separately from chromosomal DNA in bacterial cells
- Contains about 5,000-30,000 base pairs
- Replicates autonomously
KEY FEATURES FOR VECTOR USE:
1. ORIGIN OF REPLICATION (ori):
- DNA sequence where replication begins
- Allows plasmid to r...
Q5: What is PCR (Polymerase Chain Reaction)? Describe its three main steps.
PCR (Polymerase Chain Reaction) is an in vitro technique that amplifies specific DNA sequences exponentially, producing millions of copies from a single DNA molecule. It is one of the most important tools in biotechnology and genetic engineering.
THREE MAIN STEPS (One Cycle):
STEP 1 - DENATURATION (94-95°C, 15-30 seconds):
- Double-stranded DNA is heated to separate into single strands
- Hydrogen bonds between complementary bases break
- Produces single-stranded template DNA
- Temperature must...
Q6: What is DNA ligase? Explain its role in recombinant DNA formation.
DNA ligase is an enzyme that catalyzes the formation of phosphodiester bonds between DNA fragments. It is essential for joining DNA pieces in genetic engineering.
FUNCTION:
- Joins 3' hydroxyl (OH) group of one DNA strand to 5' phosphate group of another
- Seals nicks (breaks) in DNA sugar-phosphate backbone
- Catalyzes formation of covalent phosphodiester bonds
- Uses ATP energy to form these bonds
ROLE IN RECOMBINANT DNA FORMATION:
1. JOINING INSERT AND VECTOR:
- Restriction enzyme cuts bot...
Showing 6 of 8 questions. Visit the full page for complete solutions.
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