Answer: Secondary metabolites.
- A Primary metabolites
- B Inorganic ions
- C Structural macromolecules
- D Secondary metabolites
Correct answer: D. Secondary metabolites
Explanation: These are secondary metabolites - not directly involved in growth or reproduction, unlike primary metabolites such as sugars and amino acids.
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.