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With regard to enzymes, key is to lock as

Asubstrate is to activation energy
Bproduct is to substrate.
Cenzyme is to active site.
Dsubstrate is to active site.

Verified Answer :

mpanderla95

Key is to lock as D. Substrate is to active site.

The correct answer is option option D

The enzyme-substrate model resembles the lock and key model. The key is specific to the lock and it cannot fit into some other lock.

As like that of lock and key, the substrate is specific to the active sites. The substrate binds to the active as the key fits in the lock.

In this way the product formation takes place.