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NAME______________________ DATE_________ PERIOD_________ Cell Membrane Coloring Worksheet ANSWER KEY Composition of the Cell Membrane & Functions The cell membrane is also called the PLASMA membrane and is made of a phospholipid BILAYER. The phospholipids have a hydrophilic (water attracting) HEAD and two hydrophobic (water repelling) TAILS. The head of a phospholipid is made of an alcohol and PHOSPHATE group, while the tails are chains of FATTY ACID. Phospholipids can move GASES and allow water and other NONPOLAR molecules to pass through into or out of the cell. This is known as simple DIFFUSION (a PASSIVE TRANSPORT) because it does not require ENERGY and the water or molecules are moving DOWN the concentration gradient. SKETCH AND LABEL a phospholipid coloring the heads red and the tails blue. PHOSPHOLIPID Another type of lipid in the cell membrane is GLYCOLIPID that makes the membrane more fluid. Embedded in the phospholipid bilayer are CHANNEL/ TRANSPORT PROTEINS that also aid in diffusion and in cell recognition. Proteins called INTEGRAL_proteins go all the 1 way through the bilayer, while TRANS-MEMBRANE proteins are only on one side. Integral proteins are also called INTEGRAL MEMBRANE proteins. Large molecules like AMINO ACID or carbohydrates use proteins to help move across cell membranes. Some of the membrane proteins have carbohydrate (GLYCOPROTEINS ) attached to help cells in recognizing each other and certain molecules. List 4 functions of the cell or plasma membrane: a. Protective b. Regulation of transport c. Cell recognition d. Compartmentalization of subcellular parts and cells e. allow signal transduction f. Binding site g. Passageway h. Cell movement i. chemical reactions are efficient due to enzymes Correctly color code and identify the name for each part of the cell membrane. Letter Name/Color __A_ Phospholipid bilayer (no color) __B_ Integral protein (pink) __F__ Fatty acid tails (orange) ___G_ Phosphate heads (yellow) Letter _C__ __I___ __E_ Name/Color Peripheral protein (red) Cholesterol (blue) Glycoprotein (green) ___H_ Glycolipids (purple) 2 Match the cell membrane structure or its function with the correct letter from the cell membrane diagram. Letter Structure/Function Letter Structure/Function _G____ Attracts water __I___ Helps maintain __F___ Repels water __A___ Make up the bilayer __E___ ___B__ Help transport certain flexibility of membrane Involved in cell-to-cell recognition materials across the cell membrane Osmosis and Tonicity Define osmosis. NET MOVEMENT OF WATER MOLECULES ACROSS A SEMI-PERMEABLE CELL MEMBRANE DOWN A CONCENTRATION GRADIENT. In which direction does water move across membranes; up or down the concentration gradient? DOWN Define these 3 terms: 3 a. Isotonic = solutions with equal osmotic concentration b. Hypertonic = solution or medium with more SOLUTE, less SOLVENT (=water) C. Hypotonic = solution or medium with less solute, more solvent (= water) Use arrows to show the direction of water movement into or out of each cell. Color and label the cell in an isotonic environment light blue, the hypotonic environment yellow, and the hypertonic environment light green. HYPERTONIC ISOTONIC HYPOTONIC Net movement ( shown as thick lines) Match the description or picture with the osmotic condition: A. Isotonic B. C solution with a lower solute concentration __A solution in which the solute concentration is the same A_, C___ condition plant cells require 4 Hypertonic C. Hypotonic A condition that animal cells require C red blood cell bursts (cytolysis) B___ plant cell loses turgor pressure (Plasmolysis) B___ solution with a higher solute concentration A__ plant cell with good turgor pressure C___ solution with a high water concentration Label the tonicity for each solution (isotonic, hypotonic, or hypertonic): HYPOTONIC HYPOTONIC ISOTONIC ISOTONIC 5 HYPERTONIC HYPERTONIC Transport Requiring Energy What type of transport is represented by the following picture? ACTIVE TRANSPORT What energy is being used? ATP In which direction (concentration gradient), is the movement occurring? AGAINST CONC. GRADIENT Color the internal environment of the cell yellow. Color and Label the transport proteins red and the substance being moved blue. TRANSPORT PROTEINS One type of active transport is called the SODIUMPOTASSIUM pump which helps muscle cells contract. This pump uses ATP to move ions AGAINST the concentration gradient. The protein that is used to pump the ions through is called a TRANSPORT protein and it changes its SHAPE to move the ions across the cell membrane. Label and color the carrier proteins red and the ions green. 6 7