Carbohydrate
The multistep pathways of metabolism are efficient because they

locate all of the enzymes for a pathway in the same place within the cell
spread the enzymes for a pathway into several different organelles
use the same substrate for all of the enzymes in the pathway
use the same enzyme for all of the substrates in the pathway

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Carbohydrate
Fructose diphosphate accumulation would

inhibit glycolysis and gluconeogenesis
stimulate glycolysis and inhibit gluconeogenesis
inhibit glycolysis and stimulate gluconeogenesis
stimulate glycolysis and gluconeogenesis

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