alleryStart learning →How is the rate of electron transport through the chain controlled?
ABy the number of glucose molecules taken in
BBy feedback inhibition of its own enzymes
CBy the relative levels of ADP and ATP
DBy the concentration of citrate present
Answer & Solution
Correct answer: C. By the relative levels of ADP and ATP
1. Specific enzymes of the electron transport chain are unaffected by feedback inhibition.
2. The rate of electron transport is instead affected by the levels of adenosine diphosphate and adenosine triphosphate.
3. Greater consumption by a cell is indicated by a buildup of adenosine diphosphate, which speeds the chain up.
4. As usage decreases, adenosine diphosphate falls and adenosine triphosphate builds up.
5. That shift in the relative concentrations triggers the cell to slow the chain down.
6. Naming feedback inhibition of the chain enzymes is the trap, since it is the one mechanism ruled out here.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.7 Regulation of Cellular Respiration_
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