Which of the following is a similarity between C4 and CAM plants? a. Both use PEP carboxylase to

step 1 Which of these is true of both C4 and camplants? A, both use PEP -Coboxylase to fix carbon. B, b

Which of the following is a similarity between C4 and CAM...

Which of the following is a similarity between $\mathrm{C}_{4}$ and CAM plants?
a. Both use PEP carboxylase to initially fix carbon.
b. Both carry out carbon fixation and the Calvin cycle in separate cell types.
c. Both carry out the Calvin cycle at night.
d. All of the above

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Key Concepts

CAM Photosynthesis

CAM (Crassulacean Acid Metabolism) photosynthesis is a carbon fixation strategy where the temporal separation of CO2 uptake and the Calvin cycle occurs. CAM plants fix carbon dioxide at night using PEP carboxylase to form organic acids, which are stored and later decarboxylated during the day to release CO2 for the Calvin cycle, thereby enhancing water use efficiency.

C4 Photosynthesis

C4 photosynthesis is a carbon fixation mechanism that spatially separates the initial CO2 fixation and the Calvin cycle. In this pathway, carbon dioxide is initially fixed by PEP carboxylase in mesophyll cells, and the resulting four-carbon compounds are then transported to bundle sheath cells where the Calvin cycle occurs, reducing photorespiration.

PEP Carboxylase

PEP carboxylase is an enzyme that catalyzes the fixation of carbon dioxide into a four-carbon compound. It plays an essential role in certain photosynthetic pathways by allowing plants to efficiently capture carbon dioxide under specific environmental conditions.

Photosynthetic Carbon Fixation

This is the process by which inorganic carbon dioxide is converted into organic compounds by living organisms. In many plants, carbon fixation is the first step in synthesizing carbohydrates, enabling the plant to convert solar energy into chemical energy.

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