alleryStart learning →How does modern oxygenic photosynthesis differ from the older bacterial type?
AIt employs two photosystems, not one
BIt employs one photosystem, not two
CIt employs no pigments of any kind
DIt employs no electron transport chain
Answer & Solution
Correct answer: A. It employs two photosystems, not one
1. The bacterial type of photosynthesis involves only one photosystem.
2. It is typically anoxygenic, meaning it does not generate oxygen.
3. Modern oxygenic photosynthesis employs two photosystems and does generate oxygen.
4. That shift is what allowed the atmosphere to fill with oxygen.
5. Both types use pigments and electron transport chains, so those options describe no real difference.
6. Reversing the counts describes the older bacterial arrangement rather than the modern one.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.3 Using Light Energy to Make Organic Molecules_
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