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Biology Lecture Notes Chapter 5

by: Adriana Proctor

Biology Lecture Notes Chapter 5 BIO-101-105

Marketplace > Chesapeake College > Science > BIO-101-105 > Biology Lecture Notes Chapter 5
Adriana Proctor
Chesapeake College
GPA 4.0

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About this Document

These notes are what was covered in the 6-7th week of class in regards to topics such as the plasma membrane with forms of diffusion.
Fundamentals of Biology I
Doctor Hatkoff
Class Notes
Biology, lifeattheedge, plasma membrane, passive diffusion, facilitated diffusion, active diffusion, Energy, ATP, functions, reulartransport, selectivetransport, membranestructure
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This 6 page Class Notes was uploaded by Adriana Proctor on Friday September 30, 2016. The Class Notes belongs to BIO-101-105 at Chesapeake College taught by Doctor Hatkoff in Fall 2016. Since its upload, it has received 3 views. For similar materials see Fundamentals of Biology I in Science at Chesapeake College.

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Date Created: 09/30/16
Biology Lecture Notes Chapter 5 Overview: Life at the Edge ● The plasma membrane exhibits selective permeability, allowing some substances to cross it more easily than others. Cellular Membranes are Fluid Mosaics of Lipids and Proteins ● Phospholipids are the most abundant lipid in most membranes ● Phospholipids are molecules containing: -Hydrophobic (the “tail”) -Hydrophilic(the “heads”) Membrane Proteins and their Functions  A membrane is a collage of different proteins embedded in the fluid matrix of the lipid bilayer. ● Proteins determine most of the membrane’s specific functions. Six major functions of the membrane proteins include: 1. Transport 2. Enzymatic Activity 3. Signal transduction 4. Cell-cell recognition 5. Intercellular joining 6. Attachment to the Extra Cellular Matrix Membrane Structure results in Selective Permeability ● A cell must ​regulate transport​ of substances across cellular boundaries. ● Plasma membranes are ​selectively permeable​, regulating the cell’s molecular traffic. ● Transport proteins​ allow passage of hydrophilic substances across the membrane. Types of Transport Osmosis ● Movement of WATER across THE PLASMA MEMBRANE Passive Diffusion ● Movement of a molecule down its concentration gradient across THE PLASMA MEMBRANE Facilitated Diffusion ● Movement of a molecule down its concentration gradient through A PROTEIN CHANNEL Active Transport ● Movement AGAINST its concentration gradient THROUGH A PROTEIN WITH THE USE OF ENERGY Effects of Osmosis on Water Balance Osmosis ● Movement of water across the PLASMA MEMBRANE Water Balance of Cells Without Walls ● Isotonic solution: Solute concentration is the same​ as inside the cell; no net water movements across the plasma membrane. ● Hypertonic solution: Solute concentration is greater that that inside the cell; cell loses water. ● Hypotonic solution: Solute concentration is less than that inside the cell; cell gains water Passive Transport is Diffusion of a Substance across a Membrane with no Energy Investment ● Passive Transport is the tendency for molecules to spread out evenly into the available space. Substances diffuse down their ​concentration gradien​ here it is more concentrated to where it is less concentrated. Passive Diffusion -Movement of a molecule down its concentration gradient across THE PLASMA MEMBRANE. Facilitated Diffusion: Passive Transport Aided by Proteins ● Facilitated Diffusion -Movement of a molecule down its concentration gradient through the protein channel. The Need for Energy in Active Transport ● Active Transport -Movement of a molecule against its concentration gradient THROUGH A PROTEIN WITH THE USE OF ENERGY. ● Active transport requires energy, usually in the form of ATP. A.) Active Transport B.)Concentration Gradient C.)O2 + CO2 D.)Facilitated Diffusion E.)Protein


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