Answer: RuBisCO.
- A RuBisCO
- B Collagen
- C Insulin
- D Trypsin
Correct answer: A. RuBisCO
Explanation: RuBisCO, the CO<sub>2</sub>-fixing enzyme of photosynthesis, is regarded as the most abundant protein in the biosphere (collagen is the most abundant in the animal world).
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.