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Attributes of Living systems Life 102 chp 7 Notes

by: Chaison Poonpiset

Attributes of Living systems Life 102 chp 7 Notes Life 102

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Chaison Poonpiset

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Membrane structure and function -Phospholipid Bilayer -What makes membranes move? -Active/Passive transport -Protein Channel
Attributes of Living Systems
Jennifer L Neuwald
Class Notes
Life Science, Lecture Notes, Biology
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This 3 page Class Notes was uploaded by Chaison Poonpiset on Monday September 26, 2016. The Class Notes belongs to Life 102 at Colorado State University taught by Jennifer L Neuwald in Fall 2016. Since its upload, it has received 5 views.


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Date Created: 09/26/16
Life 102 Ch 7 Membrane Structure and function: Membranes: boundary layers of cells, and an organelle inside Function: to keep the cell contained and to keep organelles/what you ant in and bad stuff out Selective permeability: Some things pass, others cannot Phospholipid Bilayer: Proteins: (remember side groups! Carboxyl, hydroxyl,etc…) Proteins also have hydrophobic and hydrophilic parts Fluid Mosaic Model Fluid: Membrane components are not stationary Mosaic: Phospholipids, proteins, and other macromolecules What makes membranes Fluid(Move)? 1) Temperature: Warm T. = Fluid, Cold T. = Viscous Must maintain temp in between 2) Fatty Acid Tails: Unsaturated(Don’t have maximum amount of hydrogen bonds, have double bonds) and saturated(Has all hydrogen atoms, no double bonds) 3) Cholesterol, Can insert itself in between cell membranes( Cholesterol serves to equilibrate the temp.) Slows down fluidity, also if too cold, makes more fluid Amphipathic: having both hydrophilic and hydrophobic parts. Proteins determine membrane function: -Two types of membrane proteins 1) integral (Most are transmembrane) 2) Peripheral FIG 7.7 IN TEXTBOOK Selective Permeability: -Transport proteins: regulate and facilitate movement of things in and out of cell How do they get through the cell membrane? 1) Phospholipid bilayer Nonpolar Molecules 2) Transport proteins This is a protein Channel (Polar Molecules) Passive Transport: Down, diffusion Active Transport: Up, needs energy to go against gradient Isotonic Solution: equal [C] inside and outside the cell Hypotonic Solution: (Higher concentration in cell than outside) Water goes into the cell, cell expands Hypertonic Solution:  has a greater concentration of solutes  on the outside of a cell when compared with the inside of a  cell.


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