MCQ
Which of the following is a plasmid ?
- ✓$pBR322$
- BBam $II$
- CSal $I$
- DEco $RI$
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$I.$ Sweet potato
$II.$ Potato
$III.$ Filippers of penguins and dolphins
$IV.$ Hearts of different vertebrate
$V.$ Forelimbs of whales, bat and cheetah
The correct option is
$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine and sprayed on to vulnerable plants
$(ii)$ B. thuringiensis are used to control butterfly caterpillars, but leave other insects unharmed
$(iii) $ The toxin of B. thuringiensis is released in the blood of larvae and the larvae get killed
$(iv)$ By the development of methods of genetic engineering B. thuringiensis toxin genes have been introduced