VB SC 050S Lecture Notes - Lecture 3: Lysosome, Nuclear Membrane, Endoplasmic Reticulum
8 Sep 2016
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Document Summary
Cells: cells, tissues, organs, organ systems, organism. Cells are small, membrane enclosed units filled with a concentrated aqueous solution of chemicals and endowed with the ability to reproduce. Common characteristics: possess a limiting membrane, contain genes composed of dna. Dna same in all cells of an organism. Not all genes are equally expressed in all cells: same chemical machinery. Maybe different pathways: have a response to the environment, aqueous solution and suspension, ability to copy themselves. Few microns to one millimeter: shape. Round to rectangular to elongated: motile or non-motile. Use flagellum or changing shape to crawl for movement: aerobic or anaerobic metabolism. Aerobic can be replaced by anaerobic like if we work out a lot: specialized functions. Both external and internal membranes may differ: if dna is the same in all cells, why this diversity. Reproduce without mitotic mechanism for cell division: eukaryote.
