Consider the following equations: Equation 1: ATP + H2O ADP + Pi G1 = -?7 kcal/mol Equation 2: phosphoenolpyruvate + H2O pyruvate + Pi G2 = -?14.8 kcal/mol Equation 3: glucose + Pi glucose-6-phosphate + H2O G3 = +3.3 kcal/mol
Equation 4: ADP + Pi ATP + H2O G3 = +7 kcal/mol
Which of these equations is most likely to demonstrate energetic coupling in a cell?
A. Equations 1 and 2
B. Equations 2 and 3
C. Equations 3 and 4
D. Equations 1 and 4
E. Equations 1 and 3
Answer Key: E
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