A genetically engineered microorganism used successfully in bioremediation of oil spills is a species of
Trichoderma
Xanthomonas
Bacillus
Pseudomonas.
$A$ : Bt toxin are protein crystals containing insecticidal protein
$R$ : B. thuringiensis forms these protein crystals throughout continuously during their growth period.
Utility of fungi for steroid conversion was demonstrated by
Tobacco plant resistant to a nematode have been developed by the introduction of $DNA$ that produces (in the host cells)
$A$ drug obtained through genetic engineering and useful for treating infertility is