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A protoxin is...

A protoxin is

A

a primitive toxin

B

a denatured toxin

C

toxin produced by protozoa

D

inactive toxin

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Definition of Protoxin**: A protoxin is defined as an inactive form of a toxin. It is not harmful in its original state. 2. **Source of Protoxin**: The protoxin is produced by the soil bacterium known as *Bacillus thuringiensis*. This bacterium is commonly found in soil and is known for its insecticidal properties. 3. **Activation Process**: The protoxin becomes active when it is ingested by certain insects. This activation occurs due to the alkaline pH present in the gut of these insects. 4. **Conversion to Active Form**: Upon ingestion, the alkaline conditions in the insect's gut convert the inactive protoxin into its active form, which is referred to as the Bt toxin. 5. **Conclusion**: Therefore, the correct identification of protoxin is that it is an inactive toxin produced by *Bacillus thuringiensis*, which gets activated in the gut of insects. 6. **Answer Selection**: Among the options provided, the correct answer is that a protoxin is an inactive toxin.
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