AP BIOLOGY

Detailed explanation-1: -A substrate enters the active site of the enzyme. This forms the enzyme-substrate complex. The reaction then occurs, converting the substrate into products and forming an enzyme products complex. The products then leave the active site of the enzyme.

Detailed explanation-2: -More collisions increase the likelihood that substrate will collide with the active site of the enzyme, thus increasing the rate of an enzyme-catalyzed reaction. Above a certain temperature, activity begins to decline because the enzyme begins to denature.

Detailed explanation-3: -Collision theory states that the rate of a chemical reaction is proportional to the number of collisions between reactant molecules. The more often reactant molecules collide, the more often they react with one another, and the faster the reaction rate.

Detailed explanation-4: -At low temperatures, the number of collisions between the enzyme and substrate are reduced because molecules have low kinetic energy. Fewer collisions result in fewer successful collisions in a given time and the reaction is slow.