BIO 101 Lecture Notes - Lecture 4: Cell Membrane, Intermediate Filament, Flagellum

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Every organism is made up of one or more cells. The smallest organisms are unicellular, and cells are the functional units of multicellular organisms. This means that cells are the basic units of life. Most cells range in size from about 1 to 100 micrometers, microns, (mm; millionths of a meter), in diameter. Rna to copy the genetic blueprint and make proteins. Phospholipid bilayer interspersed with cholesterol: forms a barrier between interior and exterior of cell. Proteins embedded in the membrane serve as: communication portals, regulate passage of molecules and ions. Cytoplasm- all the fluid and structures inside the plasma membrane but outside the nucleus. Site of most biochemical reactions (metabolic activities) that support life. Assist in support, transport, shape, locomotion, cell division. Unlike the human skeleton the cytoskeleton is dynamic; the filament systems can lengthen and shorten (they are flexible) Consists of gene segments: dna stores information for. Chemically similar to dna but single stranded.

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