BIO 1140 Lecture Notes - Lecture 1: Cell Theory, Eukaryote, Archaea

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When robert hook first viewed corks under a microscope in the mid-1600s, he noticed small rooms which he called cellulae . This later led to the discovery of cells. With improvements of microscopes and 200 years of observations and gathering data came more details of organelles and generalizations, what we know today as cell biology. Cell theory (mid-1800s): all organisms are composed of one or more cells, the cell is the basic structural and functional unit of all living organisms, cells arise only from the division of pre-existing cells. Because cells are the basic structural and functional units of all living organisms, they carry out essential processes of life. Components: contain highly organized systems of molecules (dna, rna) Basic chemistry: use chemical molecules/light as energy sources (ions, sugars, proteins, lipids) Metabolism (atp): alter internal reactions as a response to changes in the external environment.

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