Competitive inhibition
1. Inhibition of enzyme action due to a substrate analogue.

2. Inhibitor binds with  the active site of the enzyme.

3. It does not exert any useful role in the living system

Allosteric inhibition
1. Inhibition of enzyme action is generally due to a product in the chain of reactions.

2. Inhibitor binds with the enzyme at a place other than the active site.

3. It helps in  controlling the excess formation of an end product.
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