Which of the following reactions could be driven by couping to the hydrolysis of

Question

Which of the following reactions could be driven by couping to the hydrolysis of ATP? (The DeltaG prime value in kJ/mol for each reaction is indicated in parentheses.)

1. glucose-1-phosphate > glucose-6-phosphate (-7.1)

2. glucose + Pi > glucose-6-phosphate (+13.8)

3. acetic acid > acetic anhydride (+99.6)

4. glucose + fructose > sucrose (+29.3)

5. glycylgycine + H2O > 2 glycine (-9.2)

My answers were

1. NO

2. Yes

3. Yes

4. Yes

5. NO

Please help me figure this problem out and I ask that you please explain. Thank you!!

Explanation / Answer

Answer:

1. NO

2. Yes

3. Yes

4. Yes

5. NO

1 and 5 reactions have negative energy changes so they can happen spontaneously and would not need to be coupled to the hydrolysis of ATP to go through.whereas the 2,3,4 reactions require more energy input.

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