Aerobic respiration of say seedlings with an intact cotyledon

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Discussion Overview

The discussion revolves around the process of aerobic respiration in seedlings, specifically focusing on the relationship between energy production and ATP synthesis, as well as the utilization of that energy in biochemical activities. The scope includes conceptual understanding of biochemical processes and energy transfer mechanisms within cells.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions the relationship between the energy produced in the aerobic respiration reaction and its conversion into ATP, expressing confusion about whether energy is produced and then converted to ATP or if it is stored directly as ATP.
  • Another participant explains that in mammalian cells, ATP is produced through glycolysis and oxidative phosphorylation, emphasizing that energy is stored by maintaining a concentration gradient of ATP relative to ADP, rather than as 'high energy bonds'.
  • A later reply mentions that ATP is utilized for driving biochemical reactions, with the exception of reactions where GTP is used.
  • One participant notes that energy is coupled with the phosphorylation of AMP and ADP during oxidative phosphorylation.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the energy dynamics in aerobic respiration and ATP synthesis. There is no consensus on the initial participant's confusion, as different explanations are provided without resolving the underlying questions.

Contextual Notes

The discussion does not clarify specific assumptions about the biochemical pathways involved, nor does it address potential limitations in the explanations provided regarding energy storage and utilization.

Who May Find This Useful

Readers interested in cellular respiration, energy metabolism, and biochemical processes in plants may find this discussion relevant.

chanderjeet
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Aerobic respiration of say seedlings with an intact cotyledon:

what happens between the energy produced in the reaction

C6H12O6 + 6O2 => 6CO2 + 6H2) + ATP

and the ATP releasing energy to drive biochemical activities?

Is energy produced and then converted to the ATP? Or is the energy stored as ATP? I'm a little confused in terms of the energy actually produced and the ATP.

Also what is the energy really used for? Besides cell division to promote growth of the seedling.
 
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I'm having a hard time understanding your question. In mammalian cells (mitochondria, anyway), ATP is produced by a couple of reactions (glycolysis and oxidative phosphorylation). The ATP is then used to provide chemical energy to drive other biochemical reactions. The important point to know is that this energy is stored, not as 'high energy bonds', but by the Gibbs free energy obtained by having a concentration of ATP (relative to ADP) much different than equilibrium.

ATP is used pretty much for every biochemical reaction, except when GTP is used.

http://en.wikipedia.org/wiki/Adenosine_triphosphate
 


Thank you very much. The link was also very helpful.
 


The energy is coupled with phosphorylation of AMP and ADP through oxidative phosphorylation.
 

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