Which of the following statements about the energy yield of aerobic respiration is NOT true?A. Less than 50% of the chemical energy stored in glucose is converted to ATP.B. Glycolysis and pyruvate oxidation together provide more NADH per glucose molecule than doesthe Krebs cycle.C. Each pair of electrons donated by an FADH2 or NADH molecule during electron transport resultsin the synthesis of more than one molecule of ATP.D. ATP is needed to transport NADH produced during glycolysis into the mitochondria.E. Most of the ATP derived during aerobic respiration results from the utilization of anelectrochemical gradient.
Question
Which of the following statements about the energy yield of aerobic respiration is NOT true?A. Less than 50% of the chemical energy stored in glucose is converted to ATP.B. Glycolysis and pyruvate oxidation together provide more NADH per glucose molecule than doesthe Krebs cycle.C. Each pair of electrons donated by an FADH2 or NADH molecule during electron transport resultsin the synthesis of more than one molecule of ATP.D. ATP is needed to transport NADH produced during glycolysis into the mitochondria.E. Most of the ATP derived during aerobic respiration results from the utilization of anelectrochemical gradient.
Solution
The statement that is NOT true about the energy yield of aerobic respiration is:
B. Glycolysis and pyruvate oxidation together provide more NADH per glucose molecule than does the Krebs cycle.
Here's why:
A. This statement is true. Less than 50% of the chemical energy stored in glucose is converted to ATP. The rest is lost as heat.
B. This statement is false. The Krebs cycle produces more NADH per glucose molecule than glycolysis and pyruvate oxidation combined.
C. This statement is true. Each pair of electrons donated by an FADH2 or NADH molecule during electron transport results in the synthesis of more than one molecule of ATP.
D. This statement is true. ATP is needed to transport NADH produced during glycolysis into the mitochondria.
E. This statement is true. Most of the ATP derived during aerobic respiration results from the utilization of an electrochemical gradient.
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