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Explore why animal cells can't photosynthesize, cell membrane structure, receptors, and more. Learn about phospholipids, the fluid mosaic model, and selective permeability. Includes essential questions and detailed explanations.
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In the top margin of pg 26: • Explain why animal cells cannot undergo photosynthesis. • Hint: Look at the difference in organelles.
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!
Standard 1.a Students know cells are enclosed within a semipermeable membranes that regulate their interaction with their surroundings.
3.3 Cell Membrane 2.1 Atoms, Ions, and Molecules 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 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
Phospholipid pg. 28 Cell Membrane “Selectively Permeable”
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?
cell membrane • The cell membrane has two major functions.
cell membrane • The cell membrane has two major functions. 1. forms a boundary between inside and outside of the cell outside cell inside cell
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 outside cell inside cell
Aphospholipid is a molecule composed of three basic parts: • A charged phosphate group • Glycerol • two fatty acid chains head tail *Draw and label this phospholipid on the top of pg 28
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
carbohydrate chain protein cell membrane cholesterol protein protein channel *Phospholipids arrange themselves like a sandwich into two layers. • Contain: • Proteins • Cholesterol • Carbohydrates
carbohydrate chain protein cholesterol protein protein channel Pg. 28-middle: draw and label the cell membrane and its parts
Fluid mosaic model: • Flexible • Phospholipids can move from side to side and slide past one another • Behaves like a fluid
The cell membrane is selectively permeable. *Draw a picture on the bottom of pg. 28 Some molecules can cross the membrane while others cannot.
The cell membrane is selectively permeable. *Draw a picture on the bottom of pg. 28 Some molecules can cross the membrane while others cannot.
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
