3.1 Cellular Energy
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The totality of an organism’s chemical reactions is called metabolism. Metabolism is an emergent property of life that arises from orderly interactions between molecules.
The totality of an organism’s chemical reactions is called metabolism. Metabolism is an emergent property of life that arises from orderly interactions between molecules.
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Membranes and membrane-bound organelles in eukaryotic cells compartmentalize intracellular metabolic processes and specific enzymatic reactions.
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The diffusion of free water across a selectively permeable membrane, whether artificial or cellular, is called osmosis.
Passive transport is diffusion of a substance across a membrane with no energy investment. Active transport uses energy to move solutes against their gradients. Bulk transport across the plasma membrane occurs by exocytosis and endocytosis.
In fluid mosaic model, the membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids.
The surface-to-volume ratio is an important parameter affecting cell size and shape.
作者: Benjamin
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Cells—the basic structural and functional units of every organism—are of two distinct types: prokaryotic and eukaryotic. Organisms of the domains Bacteria and Archaea consist of prokaryotic cells. Organisms of the domain Eukarya—protists, fungi, animals, and plants—all consist of eukaryotic cells.