- ASaprophytes
- BPrimary consumer
- CSecond trophic level
- ✓None of these
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$II.$ The cell is treated with specific concentration of a divalent cation such as $... B...$ to increase pore size in cell wall
$III. $In $...C...$ method recombinant $DNA$ is directly injected into the nucleus of an animal cell
The most appropriate option regarding $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ is
$I.$ Human insulin is made-up of $51$ amino acidsarranged in two polyperptide chains.
$II.$ The two polypeptide chains are interconnected by two disulphide bridges.
$III.$ In mammals including humans, insulin is synthesised as a pro-hormone, which contains an extra stretch called the $C$ -peptide.
$IV.$ $C$ -peptide is not present in the mature insulin
Which of the statements given above are correct?