Plant Structure
Which of the following is not an electron carrier class in the electron transport chain?

Flavoproteins
Cytochrome c oxidase
Cytochromes
Iron - sulfur proteins

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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
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
None of these

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

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

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Plant Structure
Any system that is not at equilibrium

is rushing toward equilibrium at a very rapid rate
requires an enzyme to reach equilibrium
is kinetically unstable, although it may be thermodynamically stable
is thermodynamically unstable, although it may be kinetically stable

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

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