Question

Describe the basic pathway of $\mathrm{C} 3$ photosynthesis.

   Describe the basic pathway of $\mathrm{C} 3$ photosynthesis.

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 10, Problem 54

Instant Answer

Solved by Expert Sam Limsuwannarot

06/17/2020

Step 1

Carbon Fixation: The process begins with the enzyme RuBisCO fixing carbon dioxide (CO2) from the atmosphere to a 5-carbon sugar molecule, ribulose-1,5-bisphosphate (RuBP), forming an unstable 6-carbon molecule that immediately splits into two molecules of Show more…

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Describe the basic pathway of $\mathrm{C} 3$ photosynthesis.

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Key Concepts

C3 Photosynthesis

C3 photosynthesis is the most common photosynthetic pathway in which the initial fixation of carbon dioxide (CO2) results in a stable three-carbon compound. This process takes place in the chloroplast stroma and is characterized by its reliance on the enzyme RuBisCO for CO2 assimilation.

CO2 Fixation

CO2 fixation is the process by which atmospheric carbon dioxide is incorporated into an organic molecule. In C3 photosynthesis, CO2 combines with ribulose-1,5-bisphosphate (RuBP) through the catalytic action of RuBisCO, yielding an unstable six-carbon intermediate that quickly splits into two three-carbon molecules.

Calvin Cycle

The Calvin cycle is the core set of biochemical reactions that occur in the chloroplast stroma during photosynthesis. It uses the ATP and NADPH produced by the light reactions to convert CO2 into organic sugars, with the process involving carbon fixation, reduction, and regeneration phases.

RuBisCO Enzyme

RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase) is a key enzyme in the carbon fixation stage of photosynthesis. It catalyzes the reaction between CO2 and RuBP, forming an unstable intermediate that immediately splits into two molecules of 3-phosphoglycerate, marking the entry point of carbon into the Calvin cycle.

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