Final Answer:
Rubisco is a key enzyme of photosynthesis in D: All of these use Rubisco.
Step-by-step explanation:
Cyanobacteria: Cyanobacteria, also known as blue-green algae, perform photosynthesis, and Rubisco plays a crucial role in their photosynthetic process. It helps in carbon fixation during the conversion of carbon dioxide into organic molecules.
C3 Plants: C3 plants, which include many common crops like wheat and rice, utilize Rubisco in the Calvin cycle for carbon fixation. This enzyme helps in the initial steps of carbon assimilation in these plants.
C4 Plants: In C4 plants such as corn and sugarcane, Rubisco is involved in photosynthesis, particularly in the Calvin cycle. However, C4 plants have an additional carbon fixation step that precedes the Calvin cycle, enhancing photosynthetic efficiency.
Crassulacean Acid Metabolism (CAM) Plants: CAM plants, like succulents and certain cacti, also rely on Rubisco for photosynthesis. However, these plants have a unique adaptation where they open their stomata at night to minimize water loss, fixing carbon dioxide during this period.
Rubisco is a key enzyme of photosynthesis in D: All of these use Rubisco.