Multiple Choice
The main sources of energy in photophosphorylation are sunlight and _________.
13. Photosynthesis
Cyclic vs. Non-Cyclic Photophosphorylation
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What is the important difference between cyclic & non-cyclic photosynthesis?
A
Cyclic photosynthesis generates NADPH but not ATP.
B
Cyclic photosynthesis generates ATP but not NADPH.
C
Cyclic photosynthesis generates ADP but not NADPH.
D
Cyclic photosynthesis generates ATP but not NAD+.
E
Cyclic photosynthesis generates NADP+ but not ATP.
Verified step by step guidance1
Understand the basic concept of photosynthesis, which is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
Differentiate between cyclic and non-cyclic photosynthesis. Cyclic photosynthesis involves only Photosystem I and results in the production of ATP without the production of NADPH or oxygen.
In cyclic photosynthesis, electrons are cycled back to the Photosystem I reaction center instead of being transferred to NADP+ to form NADPH. This cycling allows for the generation of ATP through photophosphorylation.
Non-cyclic photosynthesis involves both Photosystem I and Photosystem II, leading to the production of both ATP and NADPH, and the release of oxygen as a byproduct.
Recognize that the key difference is that cyclic photosynthesis generates ATP but not NADPH, whereas non-cyclic photosynthesis generates both ATP and NADPH.
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