Select the reasons why hexanoic acid releases more energy upon complete combusti
ID: 692551 • Letter: S
Question
Select the reasons why hexanoic acid releases more energy upon complete combustion to CO2 and H20 Since hexanoic acid is more oxidized than glucose, complete oxidation of hexanoic acid generates more reducing equivalents that can enter the respiratory chain. Hexanoic acid is more hydrogen rich than glucose, thus hexanoic acid is more reduced than glucose. Glucose is more reduced than hexanoic acid, thus complete combustion of glucose requires more energy than the complete combustion of hexanoic acid Complete oxidation of hexanoic acid generates more reducing equivalents that can enter the respiratory chain than the complete oxidation of glucose. Hexanoic acid is directly broken down into two molecules of acetyl-CoA. However, glucose is first broken down into two molecules of pyruvate, and then converted to acetyl-CoA, thus requiring more energy than the degradation of hexanoic acid.Explanation / Answer
Ans. Correct options. B, D
# Option B. Correct. Addition of O-atom is called the oxidation. Greater is the number of O-atoms in the compound, more oxidized would it.
Hexanoic acid is more reduced than glucose because it has lesser amount of O-atoms or greater number of H-atoms present in it.
Option D. Correct. Hexanoic acid (6 C-atoms) is a short-chain fatty acid. It would undergo 2 turn of beta-oxidation to produce 3 molecules of acetyl-CoA.
1 acetyl-CoA produces 6 NADH and 2 FADH2 when oxidized through citric acid cycle. NADH and FADH2 are called reducing equivalents which are further oxidized through ETC to produce ATP (2.5 ATP per NADH , and 1.5 ATP per FADH2).
# Glucose produces 2 acetyl-CoA where hexanoic acid produces 3 acetyl-CoA. Therefore, the reducing equivalents produced by hexanoic acid (3 acetyl-CoA gives 18 NADH and 6 FADH2) are greater than that of those from glucose (2 acetyl-CoA = 12 NADH and 4 FADH2 ; 2 NADH in glycolysis).
Due to produce more reducing equivalents, hexanoic acid produces more ATP than glucose.
# Option A. Incorrect. Hexanoic acid is more reduced than glucose.
# Option C. Incorrect. Glucose is more oxidized than hexanoic acid.
# Option E. Incorrect. Hexanoic acid is broken into three acetyl-CoA (but NOT two acetyl-CoA) through beta-oxidation.
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