Plant Structure
Which of the following statements about the outer mitochondrial membrane is not true?

The outer membrane contains porins
The outer membrane is highly permeable to substances of small molecular weight
The outer membrane is impermeable to hydrogen ions
The outer membrane is about 50% lipid and 50% protein by weight

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Plant Structure
Cellular metabolism is an example of

a series of reactions occurring under standard conditions
a series of reactions that defy the second law of thermodynamics
equilibrium metabolism
steady-state metabolism

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Plant Structure
Any system that is not at equilibrium

is thermodynamically unstable, although it may be kinetically stable
requires an enzyme to reach equilibrium
is rushing toward equilibrium at a very rapid rate
is kinetically unstable, although it may be thermodynamically 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 can live and function independently of the cell
Both strongly resemble prokaryotes, especially in size
Both have their own ribosomes
Both have their own DNA

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