C-3 cycle

...synthesize all their cell constituents using carbon dioxide as the carbon source. The most common pathways for synthesizing organic compounds from carbon dioxide are the reductive pentose phosphate (Calvin) cycle, the reductive tricarboxylic acid cycle, and the acetyl-CoA pathway (see photosynthesis: The process of photosynthesis: carbon fixation and reduction). The ...

photosynthesis

Overall reaction. The RPP cycle, in which carbon is fixed, reduced, and utilized, involves the formation of intermediate sugar phosphates in a cyclic sequence (Figure 2). One complete RPP cycle incorporates three molecules of carbon dioxide and produces one molecule of the three-carbon compound glyceraldehyde-3-phosphate (Gal3P). This three-carbon ...

...of carbon dioxide to glucose. The essential reaction involves the combining of CO₂ with the five-carbon sugar ribulose 1,5-bisphosphate (RuBP) in a series of reactions called the Calvin-Benson cycle. This reaction yields an unstable intermediate, which breaks down into two molecules of phosphoglycerate (PGA), a three-carbon acid. Each reaction is catalyzed by a specific...

• algae (in algae (biology): Photosynthesis and light-absorbing pigments)

  Photosynthesis comprises both light reactions and dark reactions (or Calvin cycle). During the dark reactions, carbon dioxide is bound to ribulose bisphosphate, a 5-carbon sugar with two attached phosphate groups, by the enzyme ribulose bisphosphate carboxylase. This is the initial step...

• Poaceae (in Poaceae (plant family): Characteristic morphological features)

  ...of grass leaves involves anatomical differences associated with two photosynthetic pathways: the pathway that synthesizes a four-carbon (C-4) compound and that which synthesizes a three-carbon (C-3) compound. The chief distinction between these two pathways is the presence of specialized, thick-walled photosynthetic cells located in sheaths surrounding vascular bundles in C-4 plants. These...

...chemical reactions in the intermediate steps of photosynthesis—the process in which carbon dioxide is converted into carbohydrates. He discovered the “Calvin cycle,” in which the “dark” photosynthetic reactions are impelled by compounds produced in the “light” reactions that occur on absorption of light by chlorophyll...