A pro-toxin is

Options

A. a primitive toxin
B. a denatured toxin
C. toxin produced by protozoa
D. inactive toxin

Answer

D

Explanation

Bt toxin protein exist as inactive protoxins but one an insect ingests the inactive toxin it is converted into an acitve form of toxin due to the alkaline pHof the gut which solubillse the cystals.