ATP Requirements for C3 & CAM Photosynthesis

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SUMMARY

The ATP requirements for synthesizing glucose from carbon dioxide (CO₂) differ between C3 and CAM photosynthesis pathways. The C4 cycle requires 3 ATP molecules to form 1/6 glucose from 1 CO₂, while CAM plants require 5 ATP molecules for the same process. Both pathways utilize 5 CO₂ molecules, with the C3 cycle needing 3 ATP for the initial fixation and an additional ATP for the regeneration of phosphoenolpyruvate (PEP). The additional ATP requirement in CAM plants is due to their unique metabolic adaptations.

PREREQUISITES
  • Understanding of photosynthesis pathways: C3, C4, and CAM
  • Knowledge of ATP production and utilization in plant metabolism
  • Familiarity with the role of CO₂ in carbohydrate synthesis
  • Basic concepts of pyruvic acid and phosphoenolpyruvate (PEP) regeneration
NEXT STEPS
  • Research the differences between C3, C4, and CAM photosynthesis mechanisms
  • Study the role of ATP in plant metabolic processes
  • Explore the significance of CO₂ fixation in various photosynthetic pathways
  • Investigate the regeneration of PEP and its importance in plant respiration
USEFUL FOR

Students of botany, plant biologists, and anyone interested in the biochemical processes of photosynthesis and plant energy metabolism.

Suraj M
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i was told that the ATP required to form 1/6 Glucose from 1 CO₂ in C4 cycle is just 3 but 5 in CAM plants...
dont both need 5 CO₂
and also why 5 CO₂??
3 for C3 cycle ..fine
one for regeneration of pyuruvic acid to PEP..fine
what about the other 1 ?
 
There isn't a way I can elaborate more on this!
 

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