Question

Cry protein is obtained from:

• A. Bt-gene present in Bacillus subtilis
• B. Cry gene present in Bacillus thuringiensis
• C. Cry gene present in the Escherichia coli
• D. Any bacteria which has a natural plasmid

Answer 1

The correct option is B Cry gene present in Bacillus thuringiensis

Bacillus thuringiensis bacteria form crystal (Cry) protein during the sporulation phase of growth. It kills lepidopterans, coleopterans, and dipterans by binding to their midgut epithelium cell surface and creating pores in it. It is an inactive protoxin, but once a target insect ingests the Cry protein. It gets solubilized in its alkaline midgut and activated by protease.