STD 12 - 8. microbes in human welfare — BIOLOGY STD 12 Science — Question

$(A)$ The earliest organisms that appeared on the earth were non­green and presumably anaerobes.

$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?

$I$. Insulin for curing diabetes, used to be extracted from the pancreas of slaughtered pig and cattle

$II$. Animal insulin is slighty different from the human insulin

$III$. Animal insulin causes some undesirable side effects such as allergy

$IV$. Bacteria cannot be made to synthesise insulin from its gene because of the presence of introns

Choose the correct option