BIOL 112 Lecture Notes - Lecture 6: Extracellular Fluid, Endomembrane System, Cytosol

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Frieder Schoeck

Document Summary

Why are cells small: because most chemical reactions in cells require diffusion, diffusing molecules do not travel long distances due to their, distance travelled is proportional to sqrt of time. No nucleus and few membrane enclosed compartments: eukaryotes. Membrane enclosed compartments organelles, therefore are larger than prokaryotes: generalized plant cell diagram o called. The endomembrane system o: orientation of membrane is always preserved (cytosolic surface of membrane remains cytosolic surface). o. Rough endoplasmic reticulum: membranes are made here. Smooth endoplasmic reticulum: lipids formed, detoxify. Animal pancreatic cell: exports digestive enzymes. Animal testis cell: exports lipid soluble signals. Goigi apparatus: sorting station, decides where proteins travel to. Pulse-chase: give a pulse of radioactively labelled amino acids, then add normal proteins and have them chase the acids, pulse are given in different intervals, and you see where they go when the time given is increased.