Answer: Catalyze chemical reactions.
- A Store energy
- B Catalyze chemical reactions
- C Transport oxygen
- D Build cell membranes
Correct answer: B. Catalyze chemical reactions
Explanation: Enzymes are biological catalysts that speed up chemical reactions without being consumed. Most enzymes are proteins.
As substrate concentration rises, reaction rate increases steeply at first, then plateaus at Vmax once every enzyme molecule is working at full capacity; Km is the substrate concentration giving half-maximal rate, and a LOWER Km means the enzyme reaches that rate with less substrate (higher affinity).
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.