Multiple Choice
Non-cyclic photophosphorylation is used to synthesize:
13. Photosynthesis
Cyclic vs. Non-Cyclic Photophosphorylation
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The main sources of energy in photophosphorylation are sunlight and _________.
A
Proton motive force.
B
Inorganic phosphate (PO43-)
C
High-energy phosphate bond.
D
CO2 and H2O.
E
Chlorophylls.
Verified step by step guidance1
Understand the concept of photophosphorylation: It is the process by which ATP is formed using the energy of sunlight during photosynthesis.
Identify the role of sunlight: Sunlight provides the initial energy required to excite electrons in chlorophyll molecules.
Recognize the importance of the proton motive force: As electrons move through the electron transport chain, protons are pumped across the thylakoid membrane, creating a proton gradient.
Explain how the proton motive force contributes to ATP synthesis: The proton gradient generates a force that drives protons back across the membrane through ATP synthase, facilitating the conversion of ADP to ATP.
Clarify the role of inorganic phosphate: Inorganic phosphate (PO4^3-) is used in the phosphorylation of ADP to form ATP, completing the process of photophosphorylation.
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