BIOL 112 Lecture Notes - Lecture 8: Golgi Apparatus, Nuclear Pore, Endomembrane System

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Lucy- Ann Joseph

Document Summary

Because chemical reactions require diffusion (large surface area to volume ratio) Have membrane enclosed nucleus and organelles (compartmentalization) E. g. plant cells rigid cell wall no ca/k atpase. Vesicles leaves one apartment (e. g. golgi apparatus), travel to and fuse with another apartment of the plasma membrane. *cytosol the fluid that contains organelles cytosolic surface of membrane remains cytosolic surface e. g. sugar chain on a protein pointing inwards when it is on golgi pointing outwards on cell membrane: nucleus. Dna transcribed into mrna or rrna by rna polymerase. *rrna directly folds into 3d structure, not translated into protein. Plays essential role in ribosome translation of proteins. Ribosome made up by 4 rrna and other proteins. Substances move through nucleus through nuclear pores: rough endoplasmic reticulum (rough er) Membrane proteins are made (rna translation in cytosol: smooth endoplasmic reticulum (rough er) Also detoxifies substances by adding oh groups to them makes them more soluble and be excreted through urine.