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Transcript
Thursday 11/15 (period 10) Warm-Up: What was the hardest part of the test? What did you need more help with? Agenda: •Hand in Vocab into INBOX •Go over Tests Monday 11/26 (Period 10) Warm-Up: What is the function of the cell (plasma) membrane? Which type of cells have plasma membranes? Agenda: • Notes on the Plasma Membrane • Cell Membrane WS HW: Plasma Membrane Practice WS Wednesday 12/7 Warm-Up: Describe the structure of the plasma membrane Agenda: • Go over HW (Cell Membrane WS) • Demo: How is a balloon like a cell membrane? • Finish Plasma Membrane Drawing • Cell Membrane WS QUIZ MONDAY Friday 12/9 Warm-Up: Draw a phospholipid. Label the hydrophilic head and hydrophobic tails. Agenda: • 3D Plasma Membrane Model • Cell Membrane MCAS Open Response Question HW: Study QUIZ MONDAY The Cell (Plasma) Membrane Warm-Up: What is the function of the cell (plasma) membrane? Which type of cells have plasma membranes? Agenda: • Notes on the Plasma Membrane • Plasma Membrane WS HW: Plasma Membrane Drawing WS - The Cell in Its Environment Plasma Membrane: A Selective Barrier All cells are surrounded by a thin, flexible barrier known as the cell (plasma) membrane (or lipid bilayer). • The cell membrane protects the contents of the cell and helps control the materials that enter and leave which….. HELPS MAINTAIN HOMEOSTASIS! Selective Permeability • The plasma membrane allows some substances to pass through while keeping others out • ANALOGY: Fish Net – Has holes that allow water and other things to pass through but not the fish Plasma Membrane • The cell membrane is made of a double-layered sheet called a phospholipid bilayer. Lipid bilayer • Phospholipid Bilayer: 2 layers of phospholipids arranged tail-to-tail • Phospholipids have hydrophillic heads & hydrophobic tails LOVE water HATE water •The heads LOVE the water (because they are polar), thus are facing the liquid inside/outside of the cell. •The tails HATE the water (because they are nonpolar), so they are facing towards the inside of the membrane. Proteins •Proteins can form channels (tunnels) for large substances to easily pass through. • Proteins can also form pumps to pump larger substances from one side of the cell to the other using energy. Carbohydrates • Carbohydrates are attached to the proteins or lipids at the membrane’s surface • They act like chemical identification cards that allow cells to recognize and interact with each other. Carbohydrate chains Cholesterol • Cholesterol helps to prevent the fatty-acid tails from sticking together Fluid Mosaic Model • Since there are so many different kinds of things in the cell membrane (and the membrane can easily move) it is called the “fluid mosaic model”. Wednesday 12/7 (period 5/6) Warm-Up: Describe the structure of the plasma membrane Agenda: • Hand in HW (Cell Membrane WS) into INBOX • Finish Plasma Membrane Drawing • MCAS Open Response Questions HW: Plasma Membrane Practice WS 7.2 The Plasma Membrane Learning Objectives • Describe how a cell’s plasma membrane functions • Identify the roles of proteins, carbohydrates, and cholesterol in the plasma membrane Plasma Membrane: A Selective Barrier _________________________________________________, flexible barrier known as the cell (plasma) membrane (or lipid bilayer). • The plasma membrane protects the ____________ ________________________________________ and helps control the materials that enter and leave. Selective Permeability • The plasma membrane _____________________________ ________________________________________________ • ANALOGY: Fish Net – Has holes that allow water and other things to pass through but not the fish Plasma Membrane • The cell membrane is made of a double-layered sheet called a phospholipid bilayer. Lipid bilayer • Phospholipid Bilayer: ________________________ __________________________________________ • Phospholipids have hydro__________ heads & hydro__________ tails LOVE water HATE water •The heads LOVE the water (because they are ____________), thus are ______________________________________inside/outside of the cell. •The tails HATE the water (because they are _________________), so they are facing towards the ___________________________________ __________________________________________________________. Proteins •Proteins can form channels for ________________________ __________________________________________________ • Proteins can also form pumps to pump substances from one side of the cell to the other using energy. Carbohydrates • Carbohydrates are _________________________________ at the membrane’s surface • They act like chemical identification cards that allow cells to __________________________________________________ ______ ___________________________________________. Carbohydrate chains Cholesterol • Cholesterol helps to _________________________ ___________________ ___________________ ___________________ Fluid Mosaic Model • ________________________________________________ in the cell membrane (and the membrane can __________ _____________) it is called the “fluid mosaic model”.
