Consider the following statements

$I$. Transgenic animals are more sensitive to the toxic substance than non-transgenic animals

$II$. Useful biological products can be produced by introducing into transgenic animals the portion of $DNA$ which codes for a particular product

$III$. Brazzein is a protein produced by a west African plant, Pentadiplandra brazzeana which is approximately $2000$ time as sweet as sugar

Which of the statements are given above are correct?

Which of the following peptide chain is removed during the maturation of proinsulin into insulin?

In the formation of ascorbic acid, the micro-organism used is

Bt toxin kills the insect by

Which of the following discoveries resulted in a Nobel Prize