2. The enzyme pyruvate kinase is another good example of a coupled reaction and

Question

2. The enzyme pyruvate kinase is another good example of a coupled reaction and also occurs in glycolysis. Here, ATP is formed by transfer of a phosphate from PEP to ADP. What is the ?G°' for the formation of ATP from PEP? Circle the correct answer.

PEP + ADP ? pyruvatae + ATP

(a) 0.0 kJ/mol

(b) +31.4 kJ/mol

(c) -31.4 kJ/mol

(d) +92.4 kJ/mol

(e) -92.4 kJ/mol

To answer questions 1-4, consult these values for hydrolysis of phosphorylated compounds phosphoenolpyruvate (PEP) pyruvate P 61.9 kJ/mol -30.5 kJ/mol ATP ADP Pi -13.8 kJ/mol glucose-6-phosphate glucose Pi -43.1 kJ/mol creatine phosphate-creatine Pi -9.7 kJ/mol glycerol 3-phosphate glycerol P 1,3-bisphosphoglycerate 3-phosphoglycerate Pi -49.0 kJ/mol

Explanation / Answer

Ans c) -31.4 kJ/mol

PEP + ADP ATP + pyruvate Go’ = -61.9 kJ/mol + 30.5 kJ/mol = -31.4 kJ/mol

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.