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The effects of temperature, PH value, substrate & enzyme concentration and those of inhibitors and cofactors are of particular biological interest and can be summarized as follows:-
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Enzymes are globular proteins and within the cell they have two fundamental roles:> They act as highly specific catalysts, greatly speeding up chemical reactions which would otherwise be hopelessly slow> They provide a mechanism whereby individual chemical reactions can be controlled, the available quantity of an enzyme determine the rate of the corresponding reaction. At the moment, hundreds of chemical reactions are in progress in a typical living cell. Theses reactions provide energy and help to maintain supplies of the many different substances needed for growth & repair. The remarkable fact that all these reactions contribute to an organized overall metabolism is due almost entirely to the production of special substances called enzymes. You can see from the fig that the specificity of an enzyme's action arises because each enzyme has a definite three dimensional shape which is complementary to that of its reacting molecules, or substrates. The first step...
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