Induced - Because the enzyme does not form chemical bonds...

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Induced-Fit Theory An enzyme-substrate complex forms when the enzyme’s active site binds with the substrate like a key fitting a lock. The shape of the enzyme must match the shape of the substrate. Enzymes are therefore very specific; they will only function correctly if the shape of the substrate matches the active site. The substrate molecule normally does not fit exactly in the active site. This induces a change in the enzymes conformation (shape) to make a closer fit.
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In reactions that involve breaking bonds, the inexact fit puts stress on certain bonds of the substrate. This lowers the amount of energy needed to break them. The enzyme does not form a chemical bond with the substrate. After the reaction, the products are released and the enzyme returns to its normal shape.
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Unformatted text preview: Because the enzyme does not form chemical bonds with the substrate, it remains unchanged. As a result, the enzyme molecule can be reused. Only a small amount of enzyme is needed because they can be used repeatedly. Activation Energy and Enzymes The amount of activation energy that is required is considerably less when enzyme is present. Conditions that Affect Enzymatic Reactions Rate of Reaction Reactions with enzymes are up to 10 billion times faster than those without enzymes. Enzymes typically react with between 1 and 10,000 molecules per second. Fast enzymes catalyze up to 500,000 molecules per second. Substrate concentration, enzyme concentration, Temperature, and pH affect the rate of enzyme reactions....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Induced - Because the enzyme does not form chemical bonds...

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