Notes Membrane Structure and Function Check In 1 What is an enzyme 2 What do they do Homework Study for your test now on Friday Oct 5 You may want to make flashcards and save the flashcards for your final exam ID: 764531
Download Presentation The PPT/PDF document "Notes – Membrane Structure and Functio..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Notes – Membrane Structure and Function
Check In 1. What is an enzyme ?2. What do they do? Homework Study for your test, now on Friday Oct. 5 . You may want to make flashcards and save the flashcards for your final exam.
Check In 1. What is an enzyme ?2. What do they do? Knowledge Rating: (finger survey) I don’t know it or I’ve never seen it. I’ve seen it before. I know it, but I don’t know how to use it. I can teach it to the class
Warm Up 1. Water is polar molecule. Define polar molecule . [1]2. Outline how salt dissolves in water. [2] Homework
Check In 1 . Water is polar molecule. Define polar molecule. [1] 2. Outline how salt dissolves in water. [2] Markscheme 1. A molecule that has a difference in charges from one side to the other 2. Slight positive charges on H attract Cl - and slight negative charges on O attract Na +
Notes – Membrane Structure and Function
Membrane functionsTo control what moves in and out of a cell or organelle To communicate with other cells
Membrane Terms Hydrophilic = water-attracting Charged or slightly charged parts of molecules Hydrophobic = water-avoidingUncharged parts of moleculesSelectively permeable = some things can pass through but others cannot
Membrane structure
Membrane structure
Phospholipid Bilayer Cell membranes are made of two layers of phospholipids. Phospholipids: 1 phosphate head + 2 lipid tails Lipid tails Phosphorous Hydrophilic Hydrophobic Cell Membrane Structure Charged = Uncharged =
Phospholipids Hydrophilic head CH 2 N(CH 3 ) 3 CH 2 O P O O O CH 2 CH CH 2 O O C O C O Choline Phosphate Glycerol (a) Structural formula (b) Space-filling model Fatty acids (c) Phospholipid symbol Hydrophobic tails Hydrophilic head Hydrophobic tails + –
Hydrophilic head WATER WATER Hydrophobic tail Why do phospholipids orient themselves like this in a watery environment?
Phospholipid Bilayer Cell membranes are made of two layers of phospholipids. Phospholipid: 1 phosphate head + 2 lipid tails Phospholipids form a bilayer around the cell Cell Membrane Structure
Cell Membrane Structure Fluid Mosaic Model Membrane is flexible, like a fluid Small molecules can “slip through” even if they are charged, like water.Membrane contains a mosaic of other molecules, like proteinsChannel proteins (transport proteins) act as tunnels that allow larger, charged molecules into the cell.
Draw and label a phospholipid Label: phosphate head, lipid tails, hydrophobic and hydrophilic
Check Out Outline the functions of membranes. [2] Homework Study for your test, now on Friday Oct. 5. You may want to make flashcards and save the flashcards for your final exam.
Check Out Draw a picture of a phospholipid and label the hydrophilic head and hydrophobic tails. [2] Homework Study for your test, now on Friday Oct. 5. You may want to make flashcards and save the flashcards for your final exam.