BIO 1140 Lecture 2: Lecture 2 The cell.doc

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Bio 1140: lecture 2: the smallest unit of life that is alive and it must have all the basic units of life, the building block of life, bounded by a membrane, and contains genetic information. Size in biology: micron: 1 um = 10^-6 m (most cells, and cell parts, nanometre: 1 nm = 10^-9 m (viruses, small cell organelles, larger macro molecules, most cells are between 1 and 100 um. Prokaryotic cells: simple structure: cell wall, plasma membrane, cytoplasm that lacks organelles, ribosomes, nucleoid, flagellum, no nucleus or membrane bound organelles. Many do not cause any harm to humans, but many others do. We are most familiar with the bacteria that cause illness: there are many different uses for bacteria. Include protists (single-celled organisms), fungi, animals, plants (multicellular: utilize the compartmentalization of cellular functions. Therefore they are able to be much bigger than prokaryotes: purple pages of text book for animal examples.

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