Enzymes

AQA Biology - B4 2

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  • Created by: K
  • Created on: 07-02-10 11:51

Enzyme Structure

Enzymes are biological catalysts
Biological catalysts are used to speed up chemical reactions
Enzymes are large proteins
If the shape of an enzyme is changed, it will become denatured, it will no longer work
active site is the place where reacting particles fit
High temperature/too alkaline or acidic - change the shape

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Factors affecting enzyme action

they move FASTER when it is WARMER -->
move around more quickly, more collisions, more energy

TOO HOT - stop working
TOO ACIDIC/TOO ALKALINE - stop working

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Aerobic Respiration

GLUCOSE + OXYGEN --> CARBON DIOXIDE + WATER (+ENERGY)

Takes place in mitochondria

The release of energy from food when oxygen is available

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Enzymes in digestion

Without enzymes, digestion would be TOO SLOW
Need to be specific conditions to work properly Breakdown large, insoluble molecules into smaller ones

Enzyme Made from Substrate Product

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Amylase Salivary glands Starch Sugar in the mouth and
Pancreas small intestine
Small Intestine

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Protease Stomach Proteins Amino Acids
Pancreas
Small Intestine

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Lipase Pancreas Lipids Fatty acids
Small Intestine

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