Question

Which of the following statements is FALSE?

1: ATP + Y -> Y-P + ADP | ΔG = -100 kcal/mol
2: Y -> B | ΔG = 50 kcal/mol
A. The phosphorylation of Y is exergonic
B. The overall reaction (1 + 2) is endergonic
C. The overall reaction (1 + 2) is exergonic
D. The phosphorylation of Y is endergonic

Answer 1

The false statement is D: The phosphorylation of Y is endergonic.

Step-by-step explanation:

The false statement is D: The phosphorylation of Y is endergonic.

According to the information provided, ATP hydrolysis is an exergonic reaction, releasing ~7 Kcal/mole of energy. This means that the phosphorylation of Y, which involves the transfer of a phosphate group from ATP to Y, is an exergonic reaction as well. Exergonic reactions release energy.

The overall reaction (1 + 2) is also exergonic because the release of energy from the hydrolysis of ATP (reaction 1) is greater than the energy required for the phosphorylation of Y (reaction 2). Therefore, statement C is true.