Final answer:
Enzymes work continuously in chemical reactions, but increasing substrate concentration may not make them work faster. All enzyme molecules can become occupied by substrate molecules, preventing additional substrate binding until products are released.
Step-by-step explanation:
Enzymes work continuously in chemical reactions. However, increasing the concentration of the substrate will not always make the enzyme work faster. This is because at some point, all the enzyme molecules become occupied by substrate molecules and cannot bind with additional substrates until the products are released.