THEATER 10 Lecture Notes - Lecture 19: Lipid Bilayer, Viral Disease, Exocytosis
Course CodeTHEATER 10
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Properties of cell arrange themselves in a way to maximize function they are trying to enhance.
• Double Cell Membrane
o In heart, cell as a barrier to protect, but the cell itself also has a membrane (double
Cell Membrane Function
• Barrier to separate from (intracellular) and extracellular
o Enables cell to make characteristic composition so that particular type of reaction
Regulation of Exchange with the Environment
• Regulates what enters and leaves cells (ions, nutrients, cellular waste, release of protein
Communication Between Cell & Environment
• Proteins enable cell to recognize/respond to molecules or changes
Plasma membrane determines the shape of cell.
• Varied shape; how the membrane forms.
Structure of Membrane
Proteins and phospholids make up most of membrane structure.
• Phospholids are main component of cell membrane (lipid molecules)
o Lipid bilayer
o Head region (lollipop) faces external environment and tails face each other
o Surrounds cell and separates cytoplasm from environment.
• Types of membrane proteins
o Integral proteins -- firmly imbedded in/attached to lipid bilayer
• Integral proteins are transmembrane -- go all the way through the membrane
(form a channel) which can regulate what goes in and out of cell
o Short chains of carbohydrates attach to integral proteins (glycoproteins)
o Peripheral proteins -- attach to membrane surface
• Supports plasma membrane from cytoplasmic side & protrudes to outside of
Animal Cell Membranes
• Membranes are selectively permeable & dynamic.
o Capable of choosing what passes across them and that can change over time or
under influence of factors (e.g. hormones)
• Selective process due to protein pores & protein carrier molecules embedded in
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