The Calvin-Benson cycle starts when . a. light is available b. carbon dioxide is attached to RuB

step 1 When does the Calvin Benson cycle start? Is A, when light is available? B, carbon dioxide is att

The Calvin-Benson cycle starts when . a. light is available...

Key Concepts

Photosynthesis

Photosynthesis is the overarching process by which green plants, algae, and certain bacteria convert light energy into chemical energy. It involves light-dependent reactions that capture energy from sunlight and store it in energy-rich molecules, and the subsequent Calvin-Benson cycle (light-independent reactions), where this energy is used to assimilate carbon dioxide into organic compounds.

Ribulose Bisphosphate (RuBP)

Ribulose bisphosphate (RuBP) is a five-carbon sugar molecule that plays a critical role in the Calvin-Benson cycle. It serves as the acceptor molecule for carbon dioxide during the process of carbon fixation, allowing the cycle to begin with the formation of a highly unstable six-carbon intermediate that rapidly converts into other organic compounds.

Calvin-Benson Cycle

The Calvin-Benson cycle is a series of biochemical reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It uses ATP and NADPH produced in the light reactions to convert carbon dioxide (CO?) into organic compounds, primarily sugars, which serve as the building blocks for the plant’s energy and structural molecules.

Carbon Fixation

Carbon fixation is the process of converting inorganic carbon dioxide into organic compounds during photosynthesis. It is the crucial first step in the Calvin-Benson cycle, where CO? is attached to a five-carbon sugar to form intermediate molecules that will eventually be transformed into sugars.

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