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The lock-and-key model refers to the way in which a substrate binds to an enzyme's active site. Similar to how a key has to be the correct one for a lock, no reaction takes place if an incorrect substrate tries to bind.


Enzymes are biological catalysts which speed up reactions. They are specific for their substrate. The lock and key hypothesis models this. Enzymes are denatured at extremes of temperature and pH.


Lock and Key Hypothesis. In order to explain why enzymes have such a high level of specificity, Emil Fischer in 1894 suggested that both a substrate and an enzyme have specific geometric shapes that fit exactly into each other. This idea of both substrates and enzymes having a natural geometric fit has been called the lock and key hypothesis.


This means that enzymes specifically react with only one or a very few similar compounds. Lock and Key Theory: The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy first postulated in 1894 by Emil Fischer. In this analogy, the lock is the enzyme and the key is the substrate.


The “lock and key” model was first proposed in 1894. In this model, an enzyme’s active site is a specific shape, and only the substrate will fit into it, like a lock and key.


When the enzyme locates its appropriate substrate, the substrate enters the receptor site and both the enzyme and substrate transform to create a complete union so the chemical reaction can occur. This modified lock and key model, known as the induced fit theory, also explains why some substrates, known as inhibitors, fit in the enzyme site but ...


"Lock and key" model. To explain the observed specificity of enzymes, in 1894 Emil Fischer proposed that both the enzyme and the substrate possess specific complementary geometric shapes that fit exactly into one another. This is often referred to as "the lock and key" model.


The lock and key model is a basic explanation of how an enzyme works. The active site is considered the lock, and the substrate the key. When the lock and key combine, they are able to form a new ...


Mechanism of Enzyme Action - Lock And Key Model And Induced Fit Model | Biology Class 11 By Khalid - Duration: 8:08. Anjum Academy 5,093 views. 8:08.


Lock and key model. Enzymes are very specific. In 1894 Emil Fischer suggested that both the enzyme and the substrate have specific complementary geometric shapes that fit exactly into one another. This is often referred to as "the lock and key" model. However, this model fails to explain what happens next.