Plant Structure
Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria?

Both have their own DNA
Both strongly resemble prokaryotes, especially in size
Both can live and function independently of the cell
Both have their own ribosomes

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Plant Structure
Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?

Electrons always go from reductants with high redox potentials to oxidants with low redox potentials
The rules governing oxidation and reduction apply only in vitro, and not in vivo
None of these
Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions

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