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Enzymes Planning Introduction Enzymes are catalysts which means that they alter the rate of reaction without themselves undergoing a permanent change. Most chemical reactions require an initial input energy called activation energy to enable them to occur. Enzymes reduce the need for activation energy and so allow reactions to take place more readily at lower temperatures than would otherwise necessary. Enzymes are chemical molecules made up of mainly proteins, however some known as ribozymes are made of RNA. They speed up chemical reactions in all living things, and allow them to occur more easily. Each particular enzyme has a unique 3-dimensional shape shared by its molecules. Within this shape there is an area called the active site which the chemical reaction occur.
Approximate Word count = 469
Approximate Pages = 1.9
(250 words per page double spaced)
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