1.3Membrane structure
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Learning objective 1._ learn to draw a plasma membrane structure.
Success criteria: _Diagram must show phospholipid bilayer _cholesterol _glycoproteins _glycolipids _integral and peripheral proteins _Use the term plasma membrane _membrane surrounding the cytoplasm
Learning objective 2._ Explain how hydrophobic and hydrophilic properties of phospholipids helps to maintain structure.
Success criteria: Clear drawing of phospholipids. Clear discription hydrophilic and hydrophobic means.
Plasma membrane_Objective_
Describe: _structure _Arrangement of phospholipids
What are membranes?_Function
_keeping cellular components inside the cell. _Allowing selected molecules to move in and out the cell. _Isolating organelles_Cytoplasm-allowing processes to occur separately. _A site for biochemical reactions. _Allows cells to change shape.
Disproven_Modal: Davson-Danielli modal
Problems: _Membrane proteins vary greatly between different cells.\ _Unclear how proteins would allow for change in shape -without breaking bonds. _Membrane proteins are hydrophobic and should not be found in aqueous cytoplasm or extracellular environment.
What membranes contain.
Phospholipids Proteins Carbohydrates Cholesterol
Phospholipid
Type of Lipid Lipid Groups_Oils_Fats_Triglycerides
Phosphate_The Head
Properties: Phosphate _(Has a negative charge and is attracted to water) Glycerol Characteristic: Hydrophilic(water loving) Polar(Uneven distribution) Soluble(Mixes with water)
Phospholipid_The Tail
Properties: Fatty acid Characteristics: Hydrophobic(Water hating) insoluble(Will not mix with water)