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Transcript
Aim: How is the cell membrane built to do its job? What are the functions of the cell membrane? 3 Basic Functions: •Acts as a container •Selectively permeable •Communication Function #1 Acts as a container Holds the contents of the cell within Function #2 Receptors Has protein shapes on the cell membrane to communicate Function #3 Selectively permeable Allows only certain molecules in and out Cell Membrane Structure Bi-layer of lipids Embedded with proteins What are the two components of the cell membrane? Lipids Proteins Components of Cell Membrane BI-LAYER OF LIPIDS Lipids (lots of lollipops with legs) Proteins Membrane Proteins: 1.Transport Proteins: (Channels) 2.Receptor Proteins STRUCTURAL CHANNEL PROTEIN Receptors RECEPTORS •Proteins for communication •Chemicals sent from other cells must fit •Lock and key concept Why is this model called the fluid mosaic model? + = •Fluid – molecules are always moving •Mosaic – made of many different molecules http://home.earthlink.net/~shalpine/anim/Life/memb.htm How do some things get through the cell membrane? Can the elephant get into the house? How is the cell membrane different from an umbrella? An umbrella is impermeable It does not allow materials through How is a window screen similar to the cell membrane? Both are semipermeable. Only certain molecules pass. What is the difference between these molecules? Some are large… Polysaccharides – many units Some are small… Monosaccharide – one unit AKA: GLUCOSE Water (Mickey Mouse) Predict which molecules will get through the membrane SELECTIVELY PERMEABLE Why do some things get through the cell membrane? Small molecules are more likely to get through the cell membrane compared to big molecules