The relationship between photosynthesis and respiration is as such↑
(1) Photorespiration:
A process that provides no energy, but causes some of the carbon dioxide destined for photosynthesis to be released again before forming sugar.
*How did it come into being? Why do plants have it?
(2) Respiration for plants
-Use carbohydrates as the main source for respiration.
-Fats/oil are used to generate energy especially in some seeds
(On a weight-to-weight basis, fats provide more energy than carbohydrates)
*Is that because fat has more C-H bonds than carbohydrates?
(3) Goals of respiration
-Trap as much as possible of the energy given off in a form of greatest value to the organism in a controlled "conflagration".
(4)Types of respiration
-Aerobic respiration
-glucose partially broken down (no oxygen required)
-breakdown of glucose into carbon dioxide and water (require oxygen)
-Anaerobic respiration
-glucose partially broken down
-breakdown of glucose into ethanol and carbon dioxide
(5)ATP (Adenosine triphosphate): The universal energy carrier
-Background: two types of phosphate bonds:
-Low energy (-P):
Linkages between phosphate & other molecules are strong
-High energy (~P):
Bond linkages was weak
-ATP: adenosine-P~P~P
-from ATP to ADP: exothermic
-from ADP to AMP: endothermic
-At rest, an adult converts daily a quantity of ATP equivalent to about one-half body weight. (*Energy consumed is related to body weight. Perhaps it is because when body weight goes up, homeostasis would be more difficult, and more energy consuming.)
-Aerobic respiration releases nearly 20 times as much of energy as its anaerobic counterpart, because in anaerobic respiration, only 7% energy is released, while the rest remains in ethanol.
