bio 1201 notes6

bio 1201 notes6 - Movement of Substances Other Than Water o...

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Movement of Substances Other Than Water o Diffusion: (molecules that are permeable) Small molecules Lipids o Permeases: (molecules that are not permeable or that move slowly) Large molecules Charged molecules Permeases: o Membrane bound proteins that facilitate the movement of molecules across the membrane o Categorized by energy use- Passive; use no energy Active; use energy o Passive: Facilitated diffusion Moves molecules down their free energy (concentration gradient) Protein carrier or protein channel Selective o Active: Active transport (pump) Moves molecules against their free energy (concentration gradient) Protein carrier Selective and requires energy (usually ATP) Other Movement into a cell: o Vesicle-mediated Transport o Endocytosis
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o Exocytosis o Not movement through a membrane Endocytosis: Cell engulfs object, becomes membrane bound vesicle Phagocytosis- large object Pinocytosis- small object, mostly liquid Receptor-mediated endocytosis- greater specificity Exocytosis: Membrane bound vesicles fuse with cell membrane and expel contents Cell walls: o Composed of carbohydrates o Separate entity from the cell o Plants, cellulose o Fungi, cellulose or chitin (amino sugars) o Bacteria, peptidoglycans (amino sugars, amino acids) Cell adhesion (Glues) o Plants- Pectin (ripe fruit) Lectin o Animals-
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bio 1201 notes6 - Movement of Substances Other Than Water o...

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