BIOLOGY
MECHANISM OF ENZYME ACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Kinetic model
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Lock & key model
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Key enzyme model
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Substrate-product model
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Detailed explanation-1: -Lock and Key Theory: This theory was postulated by Emil Fisher (1898). According to this theory, like a lock can be operated by it’s key only, similarly, a specific substrate having a specific structure only can bind with the specific active site present on the surface of a specific enzyme.
Detailed explanation-2: -A Lock and Key analogy may be used to describe the fundamental action of a single substrate enzyme. In this case, the enzyme is the lock, and the substrate is the key. Only the correct size key, which is the substrate, enters the keyhole, which is the active site of the lock, which is the enzyme.
Detailed explanation-3: -A theory to explain the mechanism of enzymatic reactions, in which it is proposed that the enzyme and substrate(s) bind temporarily to form an enzyme–substrate complex. The binding site on the enzyme is known as the ‘active site’ and is structurally complementary to the substrate(s).