Final answer:
The lock-and-key model is used to describe the interaction between enzymes and substrates. The enzyme and substrate have complementary structures and the substrate fits into the enzyme's active site. When they are bonded together, a catalytic reaction occurs.
Step-by-step explanation:
The lock-and-key model is a model used to describe the interaction between enzymes and substrates. In this model, the enzyme is represented as a lock with an active site, and the substrate is represented as a key that fits into the active site. The enzyme and substrate have complementary structures and bonding groups that allow them to fit together, similar to how a key fits a lock.
The enzyme is labeled as the lock, the substrate is labeled as the key, and the active site is the specific part of the enzyme where the substrate binds. When the enzyme and substrate are bonded together in the enzyme-substrate complex, a catalytic reaction occurs, resulting in the formation of the product.