BIOL 1840U Lecture Notes - Lecture 4: Nuclear Membrane, Nuclear Pore, Endoplasmic Reticulum
Document Summary
A semipermeable phospholipid bilayer that defines the boundary of a cell. The permeability depends on the proteins it has. The fluid mosaic model: lateral movement of membrane components. Amino acids - no (polar and large) Prokaryotic cells lack internal membrane-bound compartments (organelles) Prokaryotic plasma membranes are covered by a cell wall. The cytosol contains proteins and nucleic acids. Prokaryotes are very small compared to eukaryotes. Specialized internal compartments of the eukaryotic cell (organelles): The cytoplasm is all of the contents of a cell minus the nucleus. The cytosol is all of the contents of a cell minus all organelles. The boundary (nuclear envelope) is a double membrane that contains nuclear pores. Nuclear pores allow molecules to move in and out of the nucleus. The dna in the nucleus is packaged with proteins to conserve physical space. The endoplasmic reticulum: where proteins and lipids are made: Has a single membrane connected to the nuclear envelope.
