Which tissues carry the form of the step five enzyme that produces adenosine triphosphate rather than guanine triphosphate?
AKidney and spleen tissue
BBrain and retina tissue
CLiver and pancreas tissue
DHeart and skeletal muscle
Answer & Solution
Correct answer: D. Heart and skeletal muscle
1. Two isoenzymes exist for step five, differing by the tissue they are found in.
2. One form sits in tissues that use large amounts of adenosine triphosphate, such as heart and skeletal muscle.
3. That form produces adenosine triphosphate.
4. The second form sits in tissues with many anabolic pathways, such as liver, and produces guanine triphosphate.
5. Liver is therefore the trap here, because it is the tissue named for the other product.
6. Matching the product to the tissue's energy demand is the reasoning that settles it.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.3 Oxidation of Pyruvate and the Citric Acid Cycle_
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