Carbohydrate
The conversion of pyruvate to oxaloacetate

all of the above
occurs in the mitochondria
involves the fixation of carbon dioxide
requires biotin

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Carbohydrate
The multistep pathways of metabolism are efficient because they

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

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