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Catalysts: A catalyst alters the rate of a chemical reaction, without being changed itself.

Starch Phosphorylase: It helps to make large molecules from small ones. It builds starch molecules fromglucose molecules inside plant cells.

Metabolic Reactions: Chemical reactions that take place all the time within any living organism.

Catalase: Enzyme which speeds up the breakdown of asubstance. However, Catalase does not work in the alimentary canal. It works inside the cells of living organisms.
(Animals+Plants). It breaks down hydrogen peroxide to water and oxygen. This is necessary,because hydrogen peroxide is produced by many chemical reactions which take place inside cells. It’s a very dangerous substance

Enzymes: Enzymes are biological catalysts. Enzymes consist ofvarious types of proteins that work to drive the chemical reaction required for a specific action or nutrient. 

Ex: Inside the alimentary canal, large molecules are broken down to smaller ones in theprocess of digestion. These reactions are speeded up by enzymes. A different enzyme is needed for each kind of food.
Ex2: Starch is digested to the sugar maltose by an enzyme called AMYLASE.
Protein isdigested to amino acids by PROTEASE. These enzymes are also found in plants.

ENZYMES CHANGE SUBSTANCES TO PRODUCTS
-A chemical reaction always involves one substance changing into another.Thesubstance that is presented at the beginning of the reaction is called SUBSTRATE.
-The substance which is made by the reaction is the PRODUCT.
-Enzymes are PROTEINS. Their molecules have a very precisethree-dimensional shape. This shape includes a “dent” which is exactly the right size and shape for a molecule of the enzyme´s substrate to fit into. This “dent” is called ACTIVE SITE.

1. Theenzyme is amylase, and its active site is just the right size and shape for a starch molecule.
2. The substrate molecule slots into the active site.
3. The starch molecule is split into...
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