• Document: Cell Membrane & Tonicity Worksheet
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NAME__________ ANSWER KEY ___________________ DATE_________________ PERIOD_________ Cell Membrane & Tonicity Worksheet Composition of the Cell Membrane & Functions The cell membrane is also called the PLASMA membrane and is made of a phospholipid SKETCH AND LABEL a BI-LAYER. The phospholipids have a hydrophilic (water attracting) HEADS and two phospholipid coloring the heads red and the hydrophobic (water repelling) TAILS. The head of a phospholipid is made of an alcohol and tails blue. GLYCEROL group, while the tails are chains of FATTY ACIDS. Phospholipids can move SIDEWAYS and allow water and other NON-POLAR molecules to pass through into or out of the cell. This is known as simple PASSIVE TRANSPORT because it does not require ENERGY and the water or molecules are moving WITH the concentration gradient. Another type of lipid in the cell membrane is CHOLESTEROL that makes the membrane more fluid. Embedded in the phospholipid bilayer are PROTEINS that also aid in diffusion and in cell recognition. Proteins called INTEGRAL proteins go all the way through the bilayer, while PERIPHERAL proteins are only on one side. Large molecules like PROTEINS or carbohydrates use proteins to help move across cell membranes. Some of the membrane proteins have carbohydrate PARTS attached to help cells in recognize each other and certain molecules. List 4 functions of the cell or plasma membrane: a. CELL SIGNALING b. SELECTIVE TRANSPORT c. EXCRETION OF WASTES d. STRUCTURAL SUPPORT Correctly color code and identify the name for each part of the cell membrane. Letter Name/Color Letter Name/Color __ A ___ Phospholipid bilayer (no color) __ H ___ Peripheral protein (red) __ B ___ Integral protein (pink) __ I ____ Cholesterol (blue) __ F ___ Fatty acid tails (orange) __ C___ Glycoprotein (green) __ G ___ Phosphate heads (yellow) __ E ___ Glycolipids (purple) 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 __ F__ Repels water __ I ___ Helps maintain flexibility of membrane _G&F Make up the bilayer __ C & E___ Involved in cell-to-cell recognition __ B__ Help transport certain materials across the cell membrane 1 Define osmosis. THE MOVEMENT OF WATER ACROSS A SELECTIVELY PERMEABLE MEMBRANE FROM AN AREA OF HIGH CONCENTRATION TO AN AREA OF LOW CONCENTRATION. In which direction does water move across membranes, up or down the concentration gradient? DOWN Define these 3 terms: a. isotonic- THE CONCENTRATION OF DISSOLVED PARTICLES ARE THE SAME INSIDE AND OUTSIDE THE CELL – THERE IS NO OVERALL CHANGE IN THE CELL SIZE b. hypertonic THE CONCENTRATION OF DISSOLVED PARTICLES ARE HIGHER OUTSIDE THE CELL THAN INSIDE THE CELL– WATER WILL LEAVE THE CELL IN AN ATTEMPT TO DILUTE THE OUTSIDE CONCENTRATION c. hypotonic THE CONCENTRATION OF DISSOLVED PARTICLES ARE LOWER OUTSIDE THE CELL THAN INSIDE THE CELL– WATER WILL ENTER THE CELL IN AN ATTEMPT TO DILUTE THE INSIDE CONCENTRATION 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. Match the description or picture with the osmotic condition: A. Isotonic __ C __ solution with a lower solute concentration __A __ solution in which the solute concentration is the same B. Hypertonic __ A__ condition plant cells require __ A__ condition that animal cells require C. Hypotonic __ C __ red blood cell bursts (cytolysis) __ C ___ plant cell loses turgor pressure (Plasmolysis) __ B ___ solution with a higher solute concentration __ A __ plant cell with good turgor pressure __ C___ solution

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