Carbohydrate
Citric acid accumulation would

both (b) and (c)
stimulate fructose 1,6 diphosphatase activity
inhibit phosphofructokinase activity
stimulate phosphofructokinase activity

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Carbohydrate
The multistep pathways of metabolism are efficient because they

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

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