Biotechnology and it’s Applications – Solutions

1. Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because:

a) Bacteria are resistant to the toxin

b) Toxin is immature

c) Toxin is inactive

d) Bacteria encloses toxin as a special sac

Solution:

Correct answer: C

Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because toxin is inactive. In bacteria toxin is present in inactive form called protoxin, which becomes active after entering into the body of insect.

2. What are transgenic bacteria? Illustrate using any one example.