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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.
61
Genetic engineering has been successfully used for producing
[1]
Transgenic models for studying new treatments for certain cardiac diseases
[2]
Transgenic mice for testing safety of polio vaccine before use in humans
[3]
Animals like bulls for farm work as they have super power
[4]
Transgenic Cow-Rosie which produces high fat milk for making ghee
Answer: Transgenic mice for testing safety of polio vaccine before use in humans
62
Which one contains four pyrimidine bases?
[1]
GATCAATGC
[2]
GCUAGACAA
[3]
UAGCGGUAA
[4]
TGCCTAACG
63
Which of the following is correctly matched?
[1]
Ligase - Molecular scissors
[2]
Thermus aquaticus - Bt-gene
[3]
Agrobacterium tumefaciens - Tumour
[4]
Hind II - Plasmid vector
Answer: Agrobacterium tumefaciens - Tumour
64
The specific triplet of nitrogen bases on the transfer RNA is called
[1]
Codon
[2]
Anticodon
[3]
Genetic code
[4]
none of the above
65
Restriction endonucleases:
[1]
Are synthesized by bacteria as part of their defense mechanism
[2]
Are used for in vitro DNA synthesis
[3]
Are used in genetic engineering for ligation of two DNA molecules
[4]
Are present in mammalian cells for degradation of DNA when the cell dies
Answer: Are synthesized by bacteria as part of their defense mechanism
66
Restriction endonucleases are used in genetic engineering and theyRestriction endonucleases are used in genetic engineering and they
[1]
cut DNA at various sites
[2]
join DNA segments
[3]
cut RNA at specific sites
[4]
cut DNA at specific sites
Answer: cut DNA at specific sites
67
DNA fingerprinting was discovered by
[1]
James Watson
[2]
Alec Jeffreys
[3]
Frederick Fanger
[4]
Hargobind Khorana
68
Which of the following enzymes are used to join bits of DNA?
[1]
DNA polymerase
[2]
Primase
[3]
Ligase
[4]
Endonuclease
69
Sterilization of tissue culture medium is done by
[1]
mixing the medium with antifungal agents
[2]
filtering the medium through fine sieve
[3]
autoclaving of medium at 120° for 15 min
[4]
keeping the medium at –20°C
Answer: autoclaving of medium at 120° for 15 min
70
Which one is found only in RNA?
[1]
Cytosine
[2]
Adenine
[3]
Uracil
[4]
Guanine
71
The term gene was coined by
[1]
Mc Clintock
[2]
Morgan
[3]
Johannsen
[4]
De Duve
72
Biolistics (gene-gun) is suitable for
[1]
Constructing recombinant DNA by joining with vectors
[2]
Transformation of plant cells
[3]
Disarming pathogen vectors
[4]
DNA finger printing
Answer: Transformation of plant cells
73
Restriction endonucleases are used in genetic engineering, because
[1]
they can degrade harmful proteins
[2]
they can join DNA fragments
[3]
they can cut DNA at specific base sequences
[4]
they can cut DNA at variable sites
Answer: they can cut DNA at specific base sequences
74
Which one of the following bacteria has found extensive use in genetic engineering work in plants?
[1]
Bacillus coagulans
[2]
Xanthomonas citri
[3]
Clostridium septicum
[4]
Agrobacterium tumefaciens
Answer: Agrobacterium tumefaciens
75
DNA is found in
[1]
Chromosomes
[2]
Plastids
[3]
Mitochondria
[4]
All of the above
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