Answer: Glucose and galactose.
- A Glucose and fructose
- B Glucose and galactose
- C Galactose and fructose
- D Two glucose units
Correct answer: B. Glucose and galactose
Explanation: Lactose (milk sugar) is a disaccharide of glucose + galactose linked by a beta-1,4-glycosidic bond. Lactase enzyme breaks it down.
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.