Toxic component of Bacillus thuringiensis is

What is a recombinant $\rm {DNA}$ vaccine ? Give two examples.

A probe which is a molecule used to locate specific sequences in a mixture of $DNA$ or $RNA$ molecules could be

Technique used to detect $HIV$ in suspected $AIDS$ patient in asymptomatic stage is

Main objective of production/use of herbicide resistant $GM$ crops is to
$(A)$ -Reduce herbicide accumulation in food articles for health safety.
$(B)$ -Eliminate weeds in the field without the use of herbicides
$(C)$ -Eliminate weeds from the field without the use of manual labour.
$(D)$ -Soil pollution and biomagnification caused by herbicides.
Which of the following statements are correct?

Consider the following statements

$I$. Flavr savr is a genetically modified tomato, which remains fresh and retains its flavour much longer than the normal tomato due to blocking of synthesis of fruit softening enzyme polygalacturonase

$II$. Recently, the $US$ Government has patented the Indian 'basmati' rice as Rice-tec

$III$. Viruses, bacteria and some other harmful organisms can be used as bioweapons in biological warfare

Which of the statements given above are correct?