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Enzyme
They are GLOBULAR PROTEINS that act as catalysts. Catalysts alter the rate of
chemical reaction without undergoing permanent changes themselves. They are not
used up in the reaction, so it can be REUSED and they are effective in very small
amounts. They do not make reactions happen, just speeds…

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The molecule on which the enzyme acts is called SUBSTRATE. This fits neatly into
active site to form an enzyme-substrate complex. This is held together by temporary
bonds formed between certain amino acids of the active site and groups on the
substrate molecule.

Changing certain amino acids that are not…

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pH ON ENZYME ACTION- pH is a measure of hydrogen ion
concentration. Each enzyme has an optimum pH at which it works fastest and it
depends on where it is. For e.g. salivary amylase has an optimum pH of 7.

A change in pH alters the shape of the enzyme…

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INHIBITORS - Inhibitors slow the rate of reaction
Inhibitors interfere with the functioning of the active site and so it reduces its
activity.
They can be;
A) ACTIVE SITE DIRECTED OR COMPETITIVE
INHIBITORS-which binds to the active site of the enzyme
They have a molecular shape similar to that of…

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Commercial use of enzymes
Digestion
Biological washing powder- it contains enzymes that remove stains.
The enzymes are coated with a special wax that melts in the wash, releasing the
enzymes. Once the stains have been broken down, they are easier for the detergent
to remove
It contains proteases (removes stains…

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