Discussion
The glyoxylate cycle is used by some microorganisms when___________ is the sole carbon source.
Answer: A
Correct answer: acetate
On acetate alone the ordinary TCA cycle would oxidise both carbons to CO2, leaving nothing for biosynthesis. The glyoxylate cycle skips the two decarboxylations, so that each pair of acetate molecules yields a four-carbon compound the cell can build from.
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