MCQ
It increases the efficiency with which $DNA$ enters the bacterium through pores in its cell wall.
- A$PO^-_4$
- B$CI^-$
- ✓$Ca^{++}$
- D$Na^{++}$
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Statement $I$ : Bt toxins are insect group specific and coded by a gene cry $IAc$.
Statement $II$ : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic $\mathrm{pH}$ of the insect gut.
In the light of the above statements, choose the correct answer from the options given below: