Question

substrate products active site substrate entering active site of enzyme products leaving active site of enzyme what is the role of an enzyme? speed up the rate of chemical reactions slow down the rate of chemical reactions

Explanation:

Enzymes are biological catalysts. Catalysts increase the rate of chemical reactions by lowering the activation energy required for the reaction to occur. The diagram shows substrates binding to the enzyme's active site and products being formed, which is consistent with enzymes facilitating (speeding up) reactions. Slowing down reactions is not a role of enzymes; inhibitors might slow reactions, but enzymes act as catalysts to speed them.

Answer:

Speed up the rate of chemical reactions