In a Biochemical Reaction, a + B $\Delta$ C With $\Delta$ G ^°rxn = 30 KJ/mol

question 44

Multiple Choice

In a biochemical reaction, A + B $\Delta$ C with $\Delta$ G ^°rxn = 30 kJ/mol. Which of the following reactions might be effectively coupled to this reaction so that it becomes more spontaneous?
I.C + D $\rightarrow$ B + E
$\Delta$ G^°rxn = -40 kJ/mol
II.C + D $\rightarrow$ B + E
$\Delta$ G ^°rxn = +40 kJ/mol

• A) I only
• B) II only
• C) I or II
• D) Neither I nor II can increase spontaneity.
• E) No coupling is required, because the reaction is already spontaneous.

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