Self-Sustaining Chemical Systems:
In contrast to this structural
complexity, there is less diversity in the actual cell chemistry.
All eucaryotes respire using ,
although yeast and some other eucaryotes can get along with glycolysis
alone when is
All eucaryotes have mitochondria, with obviously homologous enzymes
for use in the citric acid cycle and respiration. Photosynthetic
eucaryotes all have Photocenters I and II, and obtain reducing equivalents
by decomposing water and releasing .
(Among procaryotes, only blue-green algae have two-center photosynthesis
The differences between any procaryote and any eucaryote are far
greater than between the most diverse of the eucaryotes: fungi and
primates, redwood and dragonfly.