This educational worksheet guides students through the process of enzyme action, including labeling diagrams and completing sentences with key biological terms.

Final Answer:
1. Enzymes are known as biological catalysts. The enzyme has an active site which the substrate molecule is able to fit into. The substrate molecule is said to have a complementary shape to the enzyme’s active site. Enzymes are said to be specific for just one reaction.
2. When the substrate and enzyme molecules temporarily combine it is known as an enzyme-substrate complex. As the enzyme holds the substrate molecule in a certain way, it puts tension on the substrate molecule. This lowers the activation energy needed for the reaction to take place. This is why reactions can occur at relatively low temperatures in living things.
3. During the reaction the substrate is turned into product. This is released from the enzyme’s active site and the enzyme molecule is left unchanged and free to carry out more reactions. Each reaction in our body involves a specific enzyme. We have thousands of different enzymes in our body.