Which process probably evolved first on the ancient Planet Earth - photosynthesis or cellular respiration?
A) Photosynthesis because it provided atmospheric oxygen that facilitated evolution of aerobic organisms.
B) Cellular respiration because carbon dioxide from citric acid cycle provided source of carbon fixation for photosynthesis.
C) Photosynthesis because there was plenty of light and CO2 in the atmosphere for carbon fixation but no organic molecules to use as carbon and energy sources.
D) Cellular respiration because it is the universal metabolic pathway.
Correct Answer:
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Q50: Together the light-dependent photosynthetic reactions produce _.
A)
Q51: The replacement electrons for Photosystem II's P680
Q52: Atmospheric oxygen is a product of _.
A)
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Q57: The ATP and NADPH produced during the
Q58: Chemoautotrophs use _ as their primary carbon
Q59: Chemoheterotrophs use organic compounds as their primary
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