18 Questions
Which process is responsible for the synthesis of ATP from ADP and inorganic phosphate in the presence of light?
Photophosphorylation
What is the name of the process that occurs when both photosystems I and II work in a series?
Non-cyclic photophosphorylation
Which pigment is involved in the initial light absorption in photosystem I?
Chlorophyll P700
Which of the following is produced during cyclic photophosphorylation?
ATP only
Where does cyclic photophosphorylation potentially occur in the chloroplast?
Stroma lamellae
What is the primary function of the electron transport chain in photosynthesis?
To generate both ATP and NADPH
Which of the following statements about cyclic photophosphorylation is correct?
It occurs when only light of wavelengths beyond 680 nm is available for excitation.
According to the chemiosmotic hypothesis, what is the primary cause of the proton gradient across the thylakoid membrane?
The splitting of water molecules on the inner side of the membrane.
Where does the accumulation of protons occur during the light reactions of photosynthesis?
In the lumen of the thylakoids.
What is the primary role of the proton gradient across the thylakoid membrane?
To drive the synthesis of ATP through chemiosmosis.
Which of the following statements about the light reactions of photosynthesis is correct?
They result in the production of ATP and NADPH.
What is the primary function of the photosystems (I and II) in the light reactions of photosynthesis?
To absorb light energy and excite electrons.
Which of the following is NOT a product of the light reaction in photosynthesis?
Glucose
What is the role of the proton gradient created across the thylakoid membrane during the light reaction?
It drives the synthesis of ATP by ATP synthase
Which of the following pigments is primarily responsible for absorbing light energy during the light reaction?
Chlorophyll a
What is the role of the CF1 portion of the ATP synthase enzyme?
It undergoes a conformational change due to the proton gradient
Which of the following processes directly depends on the presence of light?
Light reaction
What is the primary function of NADPH produced during the light reaction?
To reduce carbon dioxide in the Calvin cycle
Test your knowledge on the process of ATP synthesis through phosphorylation in cells, particularly in mitochondria and chloroplasts. Learn about photophosphorylation and non-cyclic photo-phosphorylation during photosynthesis.
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