Enzyme used in $ELISA$ test is

How many of the following statements are incorrect?
$I.$ Genes of Agrobacterium are used to produce humulin.
$II.$ Indian government has set up $\text{GEAC}$.
$III.$ $\alpha-1$-antitrypsin is used to treat $\text{PKU}$.
$IV.$ $\text{ELISA}$ serves the purpose of early diagnosis.
$V.$ Flavr-savr is a variety of pomato.

Humulin is . . . . . . .

Identify the incorrect statement.

How is a mature,functional insulin hormone different from its prohormone form?

Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how this mechanism is useful for the organism producing the toxin?