Carbohydrate
The multistep pathways of metabolism are efficient because they

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

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Carbohydrate
The function of gluconeogenesis is

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

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