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Transcript
3.3 Cell Membrane • In the top margin of pg 26: Explain why animal cells cannot undergo photosynthesis. Hint: Look at the difference in organelles. 3.3 Cell Membrane • Animal cells lack chloroplasts which is the organelle needed to convert solar energy into energy that the cell can use. Animals cannot make their own food…plants can because they have chloroplasts! 3.3 Cell Membrane Standard 1.a Students know cells are enclosed within a semipermeable membranes that regulate their interaction with their surroundings. 3.3 Cell Membrane Sponge: Set up Cornell Notes on pg. 29 Topic: 3.3 Cell Membrane Essential Question: Explain how membrane receptors transmit messages across the cell membrane Cell Membrane 2.1 Atoms,3.3 Ions, and Molecules Explain how membrane receptors transmit messages across the cell membrane Key Concept: The cell membrane is a barrier that separates a cell from the external environment pg. 28 Phospholipid 3.3 Cell Membrane Cell Membrane “Selectively Permeable” 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment. What can we compare this to in our bodies? 3.3 Cell Membrane • The cell membrane has two major functions. cell membrane 3.3 Cell Membrane • The cell membrane has two major functions. 1. forms a boundary between inside and outside of the cell cell membrane inside cell outside cell 3.3 Cell Membrane • The cell membrane has two major functions. 1. forms a boundary between inside and outside of the cell 2. controls passage of materials cell membrane inside cell outside cell 3.3 Cell Membrane Cell membranes are composed of two phospholipid layers. 3.3 Cell Membrane • A phospholipid is a molecule composed of three basic parts: head A charged phosphate group Glycerol two fatty acid chains tail *Draw and label this phospholipid on the top of pg 28 3.3 Cell Membrane Head • The head is polar • interacts with water • Hydrophilic • Attracted to water • The tail is non-polar • repelled by water • hydrophobic • Attracted to other tails Tail 3.3 Cell Membrane *Phospholipids arrange themselves like a sandwich into two layers. Contain: • Proteins • Cholesterol • Carbohydrates cell membrane carbohydrate chain cholesterol protein protein channel protein 3.3 Cell Membrane Pg. 28-middle: draw and label the cell membrane and its parts carbohydrate chain cholesterol protein protein channel protein 3.3 Cell Membrane Fluid mosaic model: • Flexible • Phospholipids can move from side to side and slide past one another • Behaves like a fluid 3.3 Cell Membrane • The cell membrane is selectively permeable. *Draw a picture on the bottom of pg. 28 Some molecules can cross the membrane while others cannot. 3.3 Cell Membrane • The cell membrane is selectively permeable. *Draw a picture on the bottom of pg. 28 Some molecules can cross the membrane while others cannot. 3.3 Cell Membrane Receptors are proteins that detect a signal molecule and performs an action in response – It binds with ligands on the outside of the cell – Once they bind, the receptor changes shape and sends a message to the inside of the cell 3.3 Cell Membrane In Da Club Video Notes