Fill in the blanks
The activated Bt toxin binds to the _______(a)_______and create _______(b)______

Answer

**Step-by-Step Solution:**

1. **Understanding Bt Toxin**: The question refers to the activated form of Bt toxin, which is derived from the bacterium Bacillus thuringiensis. This toxin is known for its insecticidal properties.

2. **Activation Process**: The Bt toxin is initially produced as an inactive form known as a protoxin or crystalline protein. When ingested by an insect, this protoxin is activated due to the alkaline pH found in the insect's gut.

3. **Binding Site**: Once activated, the Bt toxin binds to specific structures in the insect's digestive system. The correct term for this structure is the "epithelium of the midgut."

4. **Effect of Binding**: After binding, the activated Bt toxin creates "minute pores" in the midgut epithelium. This pore formation disrupts the integrity of the gut lining, leading to leakage and ultimately causing the death of the insect.

5. **Final Answers**:
- (a) epithelium of the midgut
- (b) minute pores

**Complete Sentence**: The activated Bt toxin binds to the **epithelium of the midgut** and creates **minute pores**.

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