Carbohydrate
The multistep pathways of metabolism are efficient because they

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

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Carbohydrate
Fructose diphosphate accumulation would

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

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