ESSENTIAL QUESTIONS:
Why do phospholipid tails attract each other?
How does a phospholipid bilayer help protect the loss of water in cells?
What functions do membrane proteins have within cells?
UNDERSTANDINGS / APPLICATIONS / NATURE OF SCIENCE
PHOSPHOLIPIDS
1.3.U1: Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.
HISTORICAL MODELS
1.3.NOS1: Using models as representations of the real world-there are alternative models of membrane structures.
1.3.S2: Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model.
1.3.S3: Analysis of the falsification of the Davson-Danielli model that led to the Singer-Nicolson model.
1.3.NOS2: Falsification of theories when one theory is superseded by another-evidence falsified the Davson-Danielli model.
MEMBRANE STRUCTURE
1.3.S1: Drawing of the fluid mosaic model.
1.3.U2: Membrane proteins are diverse in terms of structure, position in the membranes and function.
1.3.U3: Cholesterol is a component of animal cell membranes.
1.3.A1: Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.
Why do phospholipid tails attract each other?
How does a phospholipid bilayer help protect the loss of water in cells?
What functions do membrane proteins have within cells?
UNDERSTANDINGS / APPLICATIONS / NATURE OF SCIENCE
PHOSPHOLIPIDS
1.3.U1: Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.
HISTORICAL MODELS
1.3.NOS1: Using models as representations of the real world-there are alternative models of membrane structures.
1.3.S2: Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model.
1.3.S3: Analysis of the falsification of the Davson-Danielli model that led to the Singer-Nicolson model.
1.3.NOS2: Falsification of theories when one theory is superseded by another-evidence falsified the Davson-Danielli model.
MEMBRANE STRUCTURE
1.3.S1: Drawing of the fluid mosaic model.
1.3.U2: Membrane proteins are diverse in terms of structure, position in the membranes and function.
1.3.U3: Cholesterol is a component of animal cell membranes.
1.3.A1: Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.