Question

Assertion: ‘Cry’ proteins are named so because they are toxic proteins.
Reason: In the acidic environment of insect midgut Bt-toxin gets solubilized and then release toxic core fragment after proteolytic action.

• A. Both assertion and reason are true and the reason is a correct explanation of the assertion
  
• B. Both assertion and reason are true but the reason is not the correct explanation of the assertion
  
• C. The assertion is true but the reason is false
  
• D. Both the assertion and reason are false
  

Answer 1

The correct option is D Both the assertion and reason are false


‘Cry’ proteins are named so because they are crystalline proteins which are produced during the sporulation phase of bacterial growth.
It is an inactive protoxin that requires an alkaline medium to solubilize and proteases for activation. Once activated it binds to specific receptors located in the insect midgut epithelial cells and creates pores that eventually lead to the death of the insect. So both the assertion and reason are false.