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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Biotechnology Principles and Processes of Biology.
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
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
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
55
Which of the following is related to genetic engineering?
[1]
Mitochondrion
[2]
Golgi apparatus
[3]
Lysosome
[4]
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
57
Silencing of mRNA has been used in producing transgenic plants resistant to
[1]
Bollworms
[2]
Bacterial blights
[3]
White rusts
[4]
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
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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