LIFESCI 7B Chapter Notes - Chapter 2: Lipid Bilayer, Semipermeable Membrane, Endoplasmic Reticulum
29 Nov 2017
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Document Summary
Cell theory: cells are the most basic units of life, cells can only arise from pre-existing cells, all living things are made of cells. Is called fluid mosaic model because the phospholipids and proteins are free to move around hence fluid, and the membrane is made from both phospholipids and proteins hence, mosaic. Because of this majority of the composition is different between 2 layers. Proteins: peripheral protein are temporarily associated with the membrane or with integral protein through weak noncovalent bonds. After photobleaching (frap) in which proteins in a membrane were dyed and some of them were bleached afterwards. After a while, the bleached proteins were shown to be spread out/ Prokaryotes: no nucleus, however dna is concentrated in an area called nucleoid, theres also a small ring of dna called plasmid, plasmid contains genes like antibiotic resistance, and it can be transferred through pili.
