The endergonic conversion of ADP to ATP requires more than 30 kJ/mol. The hydrolysis of phosphoenolpyruvate...

The endergonic conversion of ADP to ATP requires more than 30 kJ/mol. The hydrolysis of phosphoenolpyruvate to pyruvate drives the conversion of ADP to ATP. What must be true about this hydrolysis?

1. The hydrolysis reaction is more endergonic than the conversion of ADP is exergonic.

2. The hydrolysis reaction is less exergonic than the conversion of ADP is endergonic.

3.The hydrolysis reaction is more exergonic than the conversion of ADP is endergonic.

4.The hydrolysis reaction is more endergonic than the conversion of ADP is endergonic.

Expert Solution

Ans. Correct option- 3. The hydrolysis reaction is more exergonic than the conversion of ADP is exergonic.

Given-

Conversion of ADP to ATP is endergonic (requires input of energy)

Hydrolysis of phosphoenolpyruvate is exergonic (releases energy)

# When an endergonic reaction (here, Conversion of ADP to ATP) is coupled to a more exergonic reaction (hydrolysis of phosphoenolpyruvate), the overall reaction occurs spontaneously- the endergonic reaction is said to be coupled with the exergonic reaction.

# Option 1- Incorrect. Conversion of ADP to ATP is endergonic.

# Option 2- Incorrect. A less exergonic reaction does NOT drive the conversion of a more endergonic reaction (here, ADP conversion).

# Option 4- Incorrect. The hydrolysis reaction is exergonic.

queen_honey_blossom answered 3 years ago

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