Question

1. The protein has been used to increase insect-resistance in plants. What is the origin of the Bt protein?

a. European corn borer

b. Agrobacterium

c. Transgenic Bt corn

d. Bacillus thuringiensis

2. When ingested, the Bt protein is not toxic to humans because:

a. Humans produce antibodies against Bt

b. Human saliva breaks down the Bt toxin

c. The human blood circulatory system gets rid of the Bt toxic

d. Humans do not have Bt receptors in their digestive system

3. True or False: Purified Bt proteins and bacteria that naturally express the Bt protein have been used as insecticides in organic farming.

4. True or False: Transgenic crops produce the Bt pro-toxin that gets activated in the gut of the insect. After activation, the Bt crystals kill the insects.

Answer 1

1) d) Bacillus thuringenesis.

2) c) human circulatory system gets rid of toxic

3) and 4) both are true

BT is the bacteria from which the cry genes have been isolated and inserted into the genomes of many plant species like maize cotton soybean for resistance to lepidoptera and dipteran pests.

This BT crops have been successful in providing many lepidoptera pests like helicoverpa and others in case of cotton