Membranes Cell membrane = Plasmalemma = Plasma membrane Surrounds cells and most organelles Forms a network of passages.

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Presentation transcript:

Membranes Cell membrane = Plasmalemma = Plasma membrane Surrounds cells and most organelles Forms a network of passages

Mitochondria, chloroplasts, and the nucleus all have a double membrane

Functions of plasmalemma 1.Keep cell contents together and separate from other cells 2.Controls movement of substances into and out of cells 3.Allow communication between cells 4.Attachment for intracellular cytoskeleton, cell walls and intercellular adhesions

Phospholipids Membranes are made of Phospholipids Hydrophilic Polar head Hydrophobic Non-polar tails

Hydrophobic tails Hydrophilic heads Watery cytosol

Water outside cell Hydrophobic tails Watery Cytoplasm

Fluid mosaic theory Phospholipids are not bound to each other Like oil on water Water inside and outside the cell feature=relatedhttp:// feature=related (fluid mosaic model, 1.5 min)

Permeability selectively permeable Membranes are selectively permeable Allow some molecules through but not all

Permeability of membrane Some membranes impermeable (eg surfaces designed to retain water such as skin, scales, exoskeletons)

MENU Key Words Exercises Quick Quiz Videos Extra slides

Key words Phospholipids Bilayer Fatty tails Phosphate head Impermeable Permeable Large molecules Ions Fluid Mosaic Back to menu

(VERY) Quick quiz 1.____ are the main component of membranes 2.They consist of hydrophobic ____ 3.And a hydrophilic ____ 4.They also have integral and peripheral ____ Answers Back to menu

(VERY) Quick quiz 1.Phospholipids are the main component of membranes 2.They consist of hydrophobic tails 3.And a hydrophilic head 4.They also have integral and peripheral proteins Back to menu

Exercise Workbook pp50-52, qq18-20 and Booklet p3 READING Pathfinder p48 (or p42) Enzymes & reaction rate Excellence in Biology pp114-6 Back to menu

Videos aVJM&feature=relatedhttp:// aVJM&feature=related (10 min, includes biotechnology) 2_int_membraneweb/ 2_int_membraneweb/ (interactive - membrane) Back to menu

Glycoproteins & glycolipids for cell recognitionhttp:// the-Cell-Membrane Back to menu

Peripheral proteins Partially embedded  intrinsic – inside cell  extrinsic – outside cell Back to menu

OIL AND WATER I told you this would be important! Back to menu

Trans-membrane (integral) proteins involved in facilitated and active transport Back to menu

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