Question

enzyme a b ph 2 4 6 8 10 12 14 the activity of b stops at a ph of 10. the enzyme activity for both a and b increases as the ph increases the optimum ph for both reactions a and b is around 4.5 the optimum ph for reaction a is approximately 6.

Explanation:

Step1: Analyze each option

• Option 1: From the graph, enzyme B still has activity above pH = 10, so this is false.
• Option 2: For enzyme A, activity decreases after a certain pH, for enzyme B, activity also has a decreasing part as pH increases, so this is false.
• Option 3: Enzyme A has maximum activity around pH = 6, enzyme B has maximum activity around pH = 8 - 9, not 4.5, so this is false.
• Option 4: The peak of enzyme A's activity curve is around pH = 6, so the optimum pH for Reaction A is approximately 6. This is true.

Answer:

The optimum pH for Reaction A is approximately 6.