NEET BIOLOGY

Detailed explanation-1: -Overheating an enzyme normally results in a loss of its ability to catalyze a reaction. This is because heat gives the atoms in the enzyme molecules enough kinetic energy to overcome the intermolecular forces that hold it in shape.

Detailed explanation-2: -As with many chemical reactions, the rate of an enzyme-catalysed reaction increases as the temperature increases. However, at high temperatures the rate decreases again because the enzyme becomes denatured and can no longer function.

Detailed explanation-3: -At high temperatures the shape of the enzyme is altered so that it is no longer complementary to its specific substrate. This effect can be permanent and irreversible and is called denaturation .

Detailed explanation-4: -As the temperature increases, molecules move more quickly, so the enzyme functions at a higher rate. Increasing temperature generally increases reaction rates, enzyme-catalyzed or otherwise.

Detailed explanation-5: -In humans, for example, temperatures above 40° cause an enzyme to become denatured. As kinetic energy increases rapidly in the presence of higher temperatures, the bonds holding an enzyme together are broken. This is due to the rapid movement of molecules comprising the protein structure of an enzyme.