During cellular respiration, the activity of phosphofructokinase can be inhibited by
A - Scottish Highers Human Biology - Question 8 - 2016
Question 8
During cellular respiration, the activity of phosphofructokinase can be inhibited by
A. ATP and citrate
B. ADP and citrate
C. ATP and lactic acid
D. ADP and lactic ... show full transcript
Worked Solution & Example Answer:During cellular respiration, the activity of phosphofructokinase can be inhibited by
A - Scottish Highers Human Biology - Question 8 - 2016
Step 1
A. ATP and citrate
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Answer
ATP acts as an inhibitor of phosphofructokinase through feedback inhibition since high levels of ATP indicate that the cell has sufficient energy. Citrate, a product of the citric acid cycle, also signals that there is an abundance of building blocks and energy, which inhibits the enzyme activity as well.
Step 2
B. ADP and citrate
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Answer
ADP is generally an activator of phosphofructokinase as it indicates low energy levels. Therefore, this option does not inhibit the enzyme.
Step 3
C. ATP and lactic acid
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Answer
While ATP inhibits phosphofructokinase, lactic acid does not have a well-defined inhibitory effect on the enzyme's activity in the context of cellular respiration.
Step 4
D. ADP and lactic acid
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Answer
Similar to option B, ADP does not inhibit the enzyme, and lactic acid is not a known inhibitor of phosphofructokinase.
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