Question

question 3
1 pts
the energy yield of a reaction can be determined by calculating
the activation energy of the reaction.
the rate of the reaction.
the change in free energy (δg).
the ratio of enzyme to substrate.

Explanation:

• Activation energy is the energy needed to start a reaction, not for determining energy yield.
• Reaction rate measures how fast a reaction occurs, not energy yield.
• $\Delta G$ (change in free energy) tells us the net energy released (if negative) or consumed (if positive) in a reaction, so it determines energy yield.
• Enzyme - substrate ratio affects reaction rate (via enzyme activity), not energy yield.

Answer:

the change in free energy ($\Delta G$).