AP BIOLOGY

Detailed explanation-1: -True or false, An enzyme speeds up a chemical reaction in the cell, but can only be used once. False.

Detailed explanation-2: -Enzymes let chemical reactions in the body happen millions of times faster than without the enzyme. Because enzymes are not part of the product, they can be reused again and again. How efficient! This is an example of an enzyme molecule (blue) and a substrate (yellow).

Detailed explanation-3: -Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.

Detailed explanation-4: -The statement is True. The statement is correct because enzymes significantly enhance the speed of chemical reactions and thus bind with the substrate or reactant molecules to form the product. They serve as biological catalysts that typically reduce the activation energy so that the product can be formed faster.

Detailed explanation-5: -Enzymes provide help with facilitating chemical reactions within each cell. Since they are not destroyed during the process, a cell can reuse each enzyme repeatedly.