Final answer:
The structure of an enzyme is critical to its function. The substrate of a reaction will bind within the enzyme's active site to form the enzyme-substrate complex. Once bound, the enzyme will change its shape slightly through induced fit.
Step-by-step explanation:
The (A) substrate of a reaction will bind within the enzyme's (B) active site to form the (A) enzyme-substrate complex. Once bound, the enzyme will change its shape slightly to fit more snugly around the (A) substrate. This process is called (B) induced fit and is similar to shaking someone's hand.