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The following diagram shows an enzyme-controlled metabolic pathway - Scottish Highers Human Biology - Question 10 - 2018
Question 10
The following diagram shows an enzyme-controlled metabolic pathway. enzyme 1 → compound P → enzyme 2 → compound Q → enzyme 3 → compound R → compound S. If enzyme 2... show full transcript
Worked Solution & Example Answer:The following diagram shows an enzyme-controlled metabolic pathway - Scottish Highers Human Biology - Question 10 - 2018
Step 1
If enzyme 2 is inhibited at time X
Answer
When enzyme 2 is inhibited, the conversion of compound P to compound Q will stop. As a result, the concentration of compound Q will decrease because it can no longer be produced. Since compound Q is a substrate for enzyme 3, the concentration of compound R will also decrease because it relies on the availability of compound Q. This inhibition implies that both compounds Q and R will show a decline in their concentrations from time X onward.
Step 2
Which graph predicts the concentrations?
Answer
Graph C accurately represents this scenario. It shows that the concentration of compound Q decreases as time progresses after enzyme 2 is inhibited, while the concentration of compound R also decreases, reflecting the dependency on compound Q.