Enzymes are made up of proteins. These catalyze the reactions and speed up the reaction by lowering the activation energy. Enzymes are named after the substrate they catalyze and a suffix ‘ase’ is added after the name of substrate to form the name of the enzyme. The enzymes bind with a particular substrate and follow the lock and key model for binding. Each enzyme has a specific site to which a particular type of substrate can bind. They work under optimum temperature and pH. Changes in these conditions affect enzyme activity.
The answer is A.