Based on the facts about chemical equilibria in animal systems, indicate for each summary reaction below if it is reversible or irreversible (don't worry about balancing the reactions). Explain the lack of reversibility. In what kind of system would the reaction(s) you selected as irreversible be reversible? Explain.
A. C6H12O6 ?CO2 + H2O
B. ADP + Pi ?ATP
C. H2O + CO2 ?H2CO3
Only A is irreversible in animal systems. The products are rapidly removed from the system as soon as they are formed, so they are not recombined. This reaction is reversible in plants, which form and store glucose for food, but also need to use some of the glucose to make ATP.
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