Question

an enzyme speeds up a reaction by lowering the activation energy needed for the reaction to happen. this is similar to

• reducing the force a ball needs to start rolling down a hill.
• increasing the height an apple will fall from a tree.
• blocking a flowing river with a dam to stop the flow.
• causing a snow storm in the middle of summer when temperatures are hot.

Explanation:

To solve this, we analyze each option:

• Option 1: Enzymes lower activation energy (energy needed to start a reaction), like reducing the force (energy) a ball needs to start rolling down a hill. This matches the enzyme's role.
• Option 2: Increasing apple fall height would increase energy needed, opposite of enzyme's action.
• Option 3: Blocking a river stops flow, while enzymes speed up reactions, not stop.
• Option 4: Summer snowstorms are impossible and unrelated to enzyme function.

Answer:

A. reducing the force a ball needs to start rolling down a hill.