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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.
31
Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein
[1]
Binds with epithelial cells of midgut of the insect pest ultimately killing it
[2]
Does not kill the carrier bacterium which is itself resistant to this toxin
[3]
Is activated by acid pH of the foregut of the insect pest
[4]
Is coded by several genes including the gene cry
Answer: Binds with epithelial cells of midgut of the insect pest ultimately killing it
32
A dividing and undifferentiated mass of cells is called
[1]
Callus
[2]
Embryo
[3]
Explant
[4]
Zygote
33
What is true about Bt toxin?
[1]
Bt protein exists as active toxin in the Bacillus
[2]
[3]
The concerned Bacillus has antitoxins
[4]
The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication
Answer: The concerned Bacillus has antitoxins
34
Which of the following enzyme joints the okazaki fragments?
[1]
DNA polymerase
[2]
DNA ligase
[3]
Helicase
[4]
Restriction endonuclease
35
Which one of the following is a case of wrong matching?
[1]
Micropropagation-In vitro production of plants in large numbers
[2]
Callus - Unorganized mass of cells produced in tissue culture
[3]
Somatic hybridization - Fusion of two diverse cells
[4]
Vector DNA - Site for t-RNA synthesis
Answer: Vector DNA - Site for t-RNA synthesis
36
Which part would be most suitable for raising virus-free plants for micropropagation?
[1]
Meristem
[2]
Node
[3]
Bark
[4]
Vascular tissue
37
Advancement in genetic engineering has been possible due to the discovery of
[1]
Oncogenes
[2]
Transposons
[3]
Exonucleases
[4]
Restriction endonuclease
Answer: Restriction endonuclease
38
Which of the following features should be present in vector?
[1]
It should replicate autonomously
[2]
It should have its own origin of replication
[3]
It should possess restriction enzyme cleavage sites
[4]
All of these
39
Agarose extracted from sea weeds finds use in
[1]
Gel electrophoresis
[2]
Spectrophotometry
[3]
Tissue culture
[4]
PCR
Answer: Gel electrophoresis
40
For transformation, micro-particles coated with DNA to be bombarded with gene gun are made up of
[1]
Silicon or Platinum
[2]
Gold or Tungsten
[3]
Silver or Platinum
[4]
Platinum or Zinc
41
Which one of the following is a correct statement?
[1]
The anticoagulant hirudin is being produced from transgenic Brassica napus seeds
[2]
Somatic hybridization involves fusion of two complete plant cells carrying desired genes
[3]
"Bt" in "Bt-cotton" indicates that it is a genetically modified organism produced through biotechnology
[4]
"Flavr Savr" variety of tomato has enhanced the production of ethylene which improves its taste
Answer: The anticoagulant hirudin is being produced from transgenic Brassica napus seeds
42
Which of the following is a genetic vector?
[1]
Plasmid
[2]
Phage
[3]
Cosmid
[4]
All of these
43
Continuous addition of sugars in 'fed batch' fermentation is done to
[1]
Degrade sewage
[2]
Produce methane
[3]
Obtain antibiotics
[4]
Purify enzymes
44
The linking of antibiotic resistance gene with the plasmid vector became possible with
[1]
Endonucleases
[2]
DNA ligase
[3]
Exonucleases
[4]
DNA polymerase
45
Bacillus thuringiensis is used to control
[1]
Nematodes
[2]
Fungal pathogens
[3]
Bacterial pathogens
[4]
Insect pests
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