DENDROLOGY

TREE PHYSIOLOGY

PHOTOSYNTHESIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In photosynthetic cells, synthesis of ATP by chemiosmosis occurs during
A
photosynthesis only
B
cellular respiration only
C
both photosynthesis and cellular respiration
D
photophosphorylation only
Explanation: 

Detailed explanation-1: -These protons can move through the membrane down their concentration gradient through ATP synthase, which then uses the energy of the proton motive force to make ATP from ADP and inorganic phosphate. This chemiosmotic mechanism of ATP production is called oxidative phosphorylation.

Detailed explanation-2: -Chemiosmosis occurs in the chloroplasts during photosynthesis, and in the mitochondria during respiration. Chemiosmosis is the method through which ATP is produced during cellular respiration.

Detailed explanation-3: -Chemiosmosis is a process in which the ATP molecules are synthesized using the proton gradient generated by the electron transport chain and ATP synthase. Chemiosmosis can occur in both photosynthesis and respiration.

Detailed explanation-4: -Where does chemiosmosis occur? In eukaryotes, it occurs in the mitochondria during cellular respiration and in the chloroplasts during photosynthesis.

Detailed explanation-5: -Chemiosmosis is the movement of ions across a semipermeable membrane bound structure, down their electrochemical gradient. An important example is the formation of adenosine triphosphate (ATP) by the movement of hydrogen ions (H+) across a membrane during cellular respiration or photosynthesis.

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