BIOL 1020 Lecture 8: September 19th 2014.docx
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BIOL 1020 Full Course Notes
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Describe the basic structure of an amino acid including the position of various groups. How do amino acids vary in their structure? o. Different side chains attached to an alpha carbon. Cells: basic structural and functional unit of every organism, cell structure was first observed by hooke and leeuwenhoek in the late 1600"s with the first microscopes they looked at plant cells. Chemical components of cells: 70% water, 30%chemical, 30 of the 40% is protein. Plasma membrane: selective barrier: allows passage of some materials (oxygen, nutrients, and waste) and blocks others, general structure is a double layer of phospholipids. Cells exists in a narrow size window: cells: 1-100 um, organelles: about 1um. Why so narrow a size range: large enough for all the things needed for life and reproduction, enzymes,dna . Prokaryotic and eukaryotic cells: have a nucleus. The first cells on earth were prokaryotic: small, did not use oxygen in metabolism, 3. 5 billion ybp.