Question

1. ______ speed up chemical reactions by lowering the activation energy

reactants
e.g. co₂ + h₂o
without enzyme
with enzyme
activation energy with enzyme
activation energy without enzyme
overall energy released during reaction
products
h₂co₃
reaction coordinate
energy
gluclose
starches
enzymes
lipids/fats

Explanation:

To solve this, we analyze each option:

• Glucose: A sugar, not a catalyst for reactions.
• Starches: Polysaccharides, used for energy storage, not reaction catalysts.
• Enzymes: Biological catalysts that lower activation energy to speed up reactions, matching the description.
• Lipids/Fats: Used for energy storage, insulation, etc., not reaction catalysts.

Answer:

C. Enzymes