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aarushiw aarushiw
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11 years ago
Which one of the following is NOT a feature of catabolism and is NOT a feature of glycolysis?


A. Reduction of compound in the pathway.
B. A net utilization of ATP.
C. Degradation -- that breaking down or breaking apart the metabolic input to the pathway.
D. Catabolic pathways, and therefore glycolysis, are energy-releasing.
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11 years ago
A couple of those could work. I'll explain each one.

A. Glycolysis results in the oxidation of glucose to two molecules of pyruvate. Oxidation here implies loss of electrons. In turn, electron carriers are picking these electrons up and themselves getting reduced. These are the electrons that electron carriers like NAD+ shuttle to the mitochondrial matrix to fuel the electron transport chain. For the most part, this can also be extended to catabolism in general, but there are exceptions.

B. Glycolysis requires the input of 2 molecules of ATP per molecule of sugar, but produces 4 molecules of ATP in the process. Overall, we end up with 2 ATP molecules.

C. This is part of the definition of catabolism itself and will certainly apply to glycolysis. We take a 6-carbon molecule of glucose and break it down into two 3-carbon pyruvate molecules.

D. Also part of the definition of catabolism. The whole reason we break these molecules down is to release the energy stored in their bonds, in order to convert it to a more useful type of energy that will allow our bodies to perform work.
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