QQuestionBiochemistry
QuestionBiochemistry
"Which of the following reactions (or set of reactions) are endergonic and which are exergonic?
a. O^2 → H^2O
b. ATP → ADP+Pi
c. Glucose → pyruvate
d. NAD+ → NADH"
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Answer
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Step 1:Let's solve this problem step by step, analyzing each reaction's energy characteristics:
Step 2:: Understanding Endergonic and Exergonic Reactions
- Endergonic reactions: Reactions that require energy input (ΔG > 0) - Exergonic reactions: Reactions that release energy (ΔG < 0)
Step 3:: Analyzing Reaction O^2 → H^2O
- This is not a complete or feasible reaction as written - Cannot definitively classify without more information - Requires additional details about conditions and reactants
Step 4:: Analyzing ATP → ADP+Pi
- $$ATP + H_2O \rightarrow ADP + P_i
- This is the hydrolysis of ATP, a fundamental energy transfer reaction - This reaction is strongly exergonic (ΔG ≈ - 30.5 kJ/mol) - Releases energy used in many cellular processes
Step 5:: Analyzing Glucose → Pyruvate
- $$C_6H_{12}O_6 \rightarrow 2 C_3H_4O_3
- This is the first step of glycolysis - Requires energy input (ATP) - Classified as an endergonic reaction
Step 6:: Analyzing NAD+ → NADH
- $$NAD^+ + 2H^+ + 2e^- \rightarrow NADH
- This is a redox reaction involving electron transfer - Typically an exergonic reaction - Releases energy during electron transport chain
Final Answer
- a. O^2 → H^2O: Insufficient information to classify - b. ATP → ADP+Pi: Exergonic - c. Glucose → pyruvate: Endergonic - d. NAD+ → NADH: Exergonic
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