Answer: Water.
- A Water
- B Protein
- C Lipid
- D Carbohydrate
Correct answer: A. Water
Explanation: Water makes up about 70-90% of the cell's mass, more than any other single component.
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.