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All living organisms fall into one of three large groups (domains) [Bacteria, Archeara, Eukarya] that define three branches of evolution from a common progenitor.

— Albert L. Lehninger

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More quotes by Albert L. Lehninger

Virtually every chemical reaction in a cell occurs at a significant rate only because of the presence of enzymes.

Despite these common properties, and the fundamental unity of life they reveal, it is difficult to make generalizations about living organisms.

The upper limit of cell size is probably set by the rate of diffusion of solute molecules in aqueous systems.

The unity and diversity of organisms become apparent even at the cellular level.

The chemistry of living organisms is organized around carbon, which accounts for more than half the dry weight of cells.

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