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NCERT - Biotechnology Principles and Processes Questions and Answers of Class 12 Biology | GkSeries

46 Polyethylene glycol is
1 Fusogenic chemical
2 Electro fusion stimulant
3 Callus stimulant
4 Differentiation stimulant

Answer: Fusogenic chemical
47 The genetically-modified (GM) brinjal in India has been developed for
1 Enhancing shelf life
2 Insect-resistance
3 Drought-resistance
4 Enhancing mineral content

Answer: Insect-resistance
48 Stirred-tank bioreactors have been designed for
1 Purification of the product
2 Addition of preservatives to the product
3 Availability of oxygen throughout the process
4 Ensuring anaerobic conditions in the culture vessel

Answer: Availability of oxygen throughout the process
49 Which purine is found in RNA?
1 Guanine
2 Cytosine
3 Thymine
4 Uracil

Answer: Guanine
50 The protein products of the following Bt toxin genes cry IA c and cry II Ab are responsible for controlling
1 Bollworm
2 Roundworm
3 Moth
4 Fruit fly

Answer: Bollworm
51 Variable number of tandem repeats (VNTRs) in the DNA molecule are highly useful in
1 Monoclonal antibody production
2 DNA fingerprinting
3 Recombinant DNA technology
4 Stemcell culture

Answer: DNA fingerprinting
52 In plant biotechnology, PEG is used in
1 Protoplast fusion
2 Cell culture preparation
3 Protoplast isolation
4 Hardening

Answer: Protoplast fusion
53 Restriction endonucleases are enzymes which
1 Recognize a specific nucleotide sequence for binding of DNA ligase
2 Make cuts at specific positions within the DNA molecule
3 Remove nucleotides from the ends of the DNA molecule
4 Restrict the action of the enzyme DNA polymerase

Answer: Make cuts at specific positions within the DNA molecule
54 Which of the following is used in Biowar?
1 A pathogen
2 Toxin from a pathogen
3 A delivery system for the bioweapon agent
4 All of these

Answer: All of these
55 Which of the following is related to genetic engineering?
1 Mitochondrion
2 Golgi apparatus
3 Lysosome
4 Plasmid

Answer: Plasmid
56 The process of RNA interference has been used in the development of plants resistant to
1 Insects
2 Nematodes
3 Fungi
4 Viruses

Answer: Nematodes
57 Silencing of mRNA has been used in producing transgenic plants resistant to
1 Bollworms
2 Bacterial blights
3 White rusts
4 Nematodes

Answer: Nematodes
58 Polyethylene glycol method is used for
1 Energy production from sewage
2 Gene transfer without a vector
3 Biodiesel production
4 Seedless fruit production

Answer: Gene transfer without a vector
59 Restriction endonucleases are most widely used in recombinant DNA technology. They are obtained from
1 Bacteriophages
2 Plasmids
3 Bacterial cells
4 All prokaryotic cells

Answer: Bacterial cells
60 Which of the following tool makes possible genetic engineering?
1 Restriction endonuclease
2 DNA polymerase
3 Helicase
4 RNA polymerase

Answer: Restriction endonuclease

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