Enzymes

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ENZYMES

most enzymes are proteins.

catalysing (speeding up) biochemical reactions. (called the biological catalysts.)

they break single substrates (compounds) into simple substances.

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or join two or more substrate molecules chemically together.

the enzyme itself will remain unchanged in the reaction.

just helps the reaction to take place quicker.

strong oxidizing agent.

the part of the enzymes surface into which the substate is bound and undergoes reactions (known as active site.)

made of different parts of polypeptide chain folds into a specific shape so that they are closer together.

for some enzymes, building sites can be very precise, allowing only a single kidn of substrate to bind to it.

some enzymes have low specificity and will accept a wide range of substrates of the same general type.

enzyme is specific for the type of chemical bond involved and not an exact substrate.

ACTIVE SITES draw the substrate to the surace of the enzyme . substrate molecules are positioned in a way to promote a reaction by joining molecules together or splitting up a larger one.

ENZYME MOLECULE the complexity of the active site is what makes each enzyme so specific.

HOW ENZYMES WORK

the enzyme and/or reactants change their shape slightly.

The reactants become bound to enzymes by weak chemical bonds.

the binding can weaken bonds within the reactants themselves, allowing the reaction to proceed more readily.

CATABOLIC REACTIONS

some enzymes can cause a single substrate molecule to be drawn into the active site.

chemical bonds are broken, causing the substrate molecule to break apart and become two molecules.

ANABOLIC REACTIONS

some enzymes can cause two substrate molecules to be drawn into the active site.

chemical bonds are formed causing the two substate molecules to form bonds and become a single molecule.

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