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Biochemistry

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Mitochondrial Respiration vs. Photorespiration

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BIOCHM-B14EO1

Mitochondrial respiration is a characteristic property of eukaryotes. Plants, however, also possess a photorespiratory pathway with some similarities to mitochondrial respiration, but also significant differences.

Examine the simplified schematic of photorespiration shown below and then identify ALL of the following statements which do NOT correctly compare/contrast mitochondrial respiration and photorespiration.

Purdon, Rachel. Simplified Pathway of Higher Plant Photorespiration (phosphyglycolate Metabolism). Alongside Simple Calvin Cycle.Wikimedia Commons, 11 Feb. 2013. Web. 7 June 2016.

A

Both mitochondrial respiration and photorespiration have at least some reactions occurring in mitochondria.

B

Both pathways function optimally at low (less than 21%) ${ O }_{ 2 }$ concentrations.

C

In plants, both pathways exhibit enhanced rates in the dark vs. light.

D

In plants, photorespiration only occurs in the green, photosynthesizing cells, whereas respiration takes place in all of the cells of the plant.

E

Both mitochondrial respiration and photorespiration consume ${ O }_{ 2 }$ and evolve ${ CO }_{ 2 }$.

F

Both pathways generate ATP, although less is produced by photorespiration than by mitochondrial respiration.

G

The main function of photorespiration is the salvaging of carbon, whereas the main function of mitochondrial respiration is the production of ATP.