Question

Choose the correct option.

• A. $E+S⟶ES⟶E+P⟶EP$
• B. $E+S\rightleftharpoons ES\to E-P⟶E+P$
• C. $E+S⟶ES\rightleftharpoons E-P⟶E+P$
• D. $E+S\rightleftharpoons ES\rightleftharpoons E-P\rightleftharpoons E+P$

Answer 1

Answer: (B)

Each enzyme $(E)$ has a substrate $(S)$ binding site in its molecule, so that a highly reactive enzyme substrate complex $(ES)$ is produced. This complex is short-lived and dissociates into its product and the unchanged enzyme with an intermediate formation of the enzyme product complex $(EP)$.
Thus, the correct representation is
$E+S\rightleftharpoons ES⟶E-P⟶E+P$