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Question
When the digestive enzyme carboxypeptidase binds to the substrate, it causes a change in the chemical bonds of the substrate to form the product. This model of enzyme activity is known as
When the digestive enzyme carboxypeptidase binds to the substrate, it causes a change in the chemical bonds of the substrate to form the product. This model of enzyme activity is known as
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Solution
The correct option is C induced fit model.
Each enzyme has a substrate binding site which is also known as active site. Binding of the substrate to the active site produces a highly reactive short lived complex called Enzyme substrate complex. This complex breaks up into chemical products and unchanged enzyme along with the intermediate formation of Enzyme-product complex. There are two views by which enzymes are supposed to bring about chemical reaction.1. Lock and key hypothesis: According to this hypothesis, the enzyme and its substrate have a complementary shape. A particular substrate binds to specific site of enzyme molecule. The hypothesis can be explained easily by the fact that a particular lock can be opened by a particular key which is specially designed to open it. Similarly enzymes have specific sites where a particular substrate can be attached. 2. Induced fit hypothesis: According to this hypothesis, the active site of the enzyme is not considered to be rigid, instead it is static in nature and have two groups- buttressing group and catalytic group. The buttressing group is meant for supporting the substrate and the catalytic group is able to weaken the bonds of the substrate. Catalytic group helps in catalysing a chemical reaction and the substrate is converted to the product.Hence when the digestive enzyme carboxypeptidase binds to the substrate and it causes a change in the chemical bonds of the substrate to form the product, the enzyme activity is occurring as per the induced fit hypothesis. So, the correct answer is 'induced fit model'.
Each enzyme has a substrate binding site which is also known as active site. Binding of the substrate to the active site produces a highly reactive short lived complex called Enzyme substrate complex. This complex breaks up into chemical products and unchanged enzyme along with the intermediate formation of Enzyme-product complex. There are two views by which enzymes are supposed to bring about chemical reaction.
1. Lock and key hypothesis: According to this hypothesis, the enzyme and its substrate have a complementary shape. A particular substrate binds to specific site of enzyme molecule. The hypothesis can be explained easily by the fact that a particular lock can be opened by a particular key which is specially designed to open it. Similarly enzymes have specific sites where a particular substrate can be attached.
2. Induced fit hypothesis: According to this hypothesis, the active site of the enzyme is not considered to be rigid, instead it is static in nature and have two groups- buttressing group and catalytic group. The buttressing group is meant for supporting the substrate and the catalytic group is able to weaken the bonds of the substrate. Catalytic group helps in catalysing a chemical reaction and the substrate is converted to the product.
Hence when the digestive enzyme carboxypeptidase binds to the substrate and it causes a change in the chemical bonds of the substrate to form the product, the enzyme activity is occurring as per the induced fit hypothesis.
So, the correct answer is 'induced fit model'.
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