Multiple Choice
In the context of prokaryotic photosynthesis, how did early oxygenic photosynthetic bacteria (e.g., cyanobacteria) most directly change Earth's atmosphere and biosphere?
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13. Photosynthesis
Prokaryotic Photosynthesis
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Oxygen produced during oxygenic photosynthesis comes directly from:
A
Light energy.
B
CO2.
C
H2O.
D
Glucose.
E
None of the above.
Verified step by step guidance1
Understand the process of oxygenic photosynthesis, which occurs in plants, algae, and cyanobacteria. This process converts light energy into chemical energy, producing oxygen as a byproduct.
Identify the main reactants involved in oxygenic photosynthesis: carbon dioxide (CO2) and water (H2O). These reactants are used to produce glucose and oxygen.
Recognize that the light-dependent reactions of photosynthesis occur in the thylakoid membranes of chloroplasts, where light energy is absorbed by chlorophyll and used to split water molecules (H2O).
Note that the splitting of water molecules, known as photolysis, releases oxygen (O2) as a byproduct. This is the source of the oxygen produced during photosynthesis.
Conclude that the oxygen produced during oxygenic photosynthesis comes directly from the splitting of water molecules (H2O), not from CO2, light energy, or glucose.
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