A substance that controls the rate of a chemical reaction without being used up in the reaction.

A 3D-shaped protein that acts as a biological catalyst.

The molecule an enzyme acts on.

The molecule formed by enzyme action.

Enzyme specificity Each type of enzyme acts only on one substrate or class of substrates due to the unique shape of its active site.

There is a small, unique depression on the surface of the enzyme called the active site. The shape of the active site matches the shape of the substrate it acts on.

Catabolic reaction/example

A reaction where large molecules are broken down into smaller molecules e.g Respiration

Anabolic reaction and example

A reaction where small molecules build up into large molecules e.g photosynthesis

An enzyme stops working when its shape has changed so much that it no longer fits with substrate molecules. At this point, the enzyme is denatured. Human enzymes are denatured beyond 60 °C.

An enzyme that has lost its normal shape and ability to work properly.

Factors affecting enzymes

• substrate concentration • enzyme concentration • temperature • environmental pH.

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Bio 5th ch 26, 27

Question	Answer
Catalyst	A substance that controls the rate of a chemical reaction without being used up in the reaction.
Enzyme	A 3D-shaped protein that acts as a biological catalyst.
Enzyme chemical nature
Substrate	The molecule an enzyme acts on.
Product	The molecule formed by enzyme action.
Specific	Enzyme specificity Each type of enzyme acts only on one substrate or class of substrates due to the unique shape of its active site.
Active site	There is a small, unique depression on the surface of the enzyme called the active site. The shape of the active site matches the shape of the substrate it acts on.
Metabolism
Catabolic reaction/example	A reaction where large molecules are broken down into smaller molecules e.g Respiration
Anabolic reaction and example	A reaction where small molecules build up into large molecules e.g photosynthesis
	The are made in the ribosomes and protein
	The sum of all chemical reactions that take place
Optimum conditions
Denaturation	An enzyme stops working when its shape has changed so much that it no longer fits with substrate molecules. At this point, the enzyme is denatured. Human enzymes are denatured beyond 60 °C.
Denatured enzyme	An enzyme that has lost its normal shape and ability to work properly.
Activation energy
Factors affecting enzymes	• substrate concentration • enzyme concentration • temperature • environmental pH.

Created by: Louie Masterson

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