In the table below, you can find the minimum, maximum and optimum pH values that are required for enzymes X, Y, Z, W, and Q to function.
Enzyme X: minimum 6.4, optimum 7.1, maximum 8.2
Enzyme Y: minimum 3.9, optimum 5.3, maximum 7.2
Enzyme Z: minimum 4.0, optimum 6.2, maximum 8.5
Enzyme W: minimum 8.0, optimum 9.1, maximum 12.1
Enzyme Q: minimum 1.3, optimum 5.4, maximum 9.5
Which of the pairs of enzymes listed below cannot function together in the same environment?
A) Y and Z
B) Y and W
C) X and Y
D) W and Q
E) X and Z
IMAT 2023 · Question 12
Q12 - The role of enzymes
Pinned
The correct answer is B) Y and W.
Two enzymes can only work together if their pH ranges overlap somewhere.
Y works up to pH 7.2, and W only starts at pH 8.0, so there's no pH where both are active.
Every other pair overlaps: Y and Z from 4.0 to 7.2, X and Y from 6.4 to 7.2, W and Q from 8.0 to 9.5, X and Z from 6.4 to 8.2.
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