Question

1. the role of the enzyme in catalysis is to:

(a) convert all substrate to product.
(b) increase the free - energy difference between substrate and product.
(c) stabilize the product relative to the substrate.
(d) lower the energy of activation.

Explanation:

Enzymes are biological catalysts. They do not alter the free-energy difference between substrate and product, nor do they force all substrate to become product or stabilize products relative to substrates. Their core function is to speed up reactions by reducing the energy required to start the reaction, known as the activation energy.

Answer:

(d) lower the energy of activation.