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

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Carbohydrate
The function of gluconeogenesis is

maintenance of blood glucose levels during starvation or a low carbohydrate diet
All of these
recovery of lactate from fermentation and glycerol from fat breakdown
a pathway for the utilization of amino acids

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