Plant Structure
Which of the following statements about mitochondrial proteins is true?

Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
All mitochondrial proteins are imported from the cytoplasm
Mitochondrial proteins arise from other mitochondrial proteins
All mitochondrial proteins are coded for and synthesized in the mitochondria

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Plant Structure
The mitochondria were known in the nineteenth century to be osmotically active on the basis of evidence that

the mitochondrial matrix is hypotonic to the cellular cytoplasm
mitochondria were derived from a symbiotic bacterium
the mitochondrial matrix is hypertonic to the cellular cytoplasm
mitochondria are surrounded by a semi permeable membrane

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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?

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

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