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Bell Ringer • What are the major differences between plant and animal cells? • When looking under a microscope, you cannot see the organelles of the cell. How can you distinguish between a plant and animal cell under a microscope? • What is the major function of cells that most organelles are involved in?
CellMembrane • Lipid Bilayer • Protection for the cell • Controls movement of substances into and out of the cell • Selectively permeable • Allows some molecules to pass through but not others
Cell Wall • Found in plants, fungi, and many bacteria • Surrounds cell membrane to provide extra support and protection • Made of cellulose (tough carbohydrate)
Membrane Transport SPI 3210.1.7 Predict the movement of water and other molecules across selectively permeable membranes. Essential Question: What are the types of passive transport and how do they differ from active transport?
Diffusion • Movement of particles from an area of high concentration to low concentration. • Concentration gradient • No energy required • Passive transport http://www.visualphotos.com/image/1x7465687/food-coloring_dispersed_in_water_illustrating
Diffusion • Particles will continue to move until reaching equilibrium. • Factors that affect the rate of diffusion: • Concentration, temperature, pressure, size and charge of the substance.
Facilitated Diffusion • Diffusion across cellmembrane • Channel proteins • Carrier proteins • Passive transport • No energy needed
Osmosis • Osmosis is the diffusion of water. • Water molecules move to the area with higher concentration of solute(sugar in the picture). http://bio1151.nicerweb.com/Locked/media/ch07/osmosis.html
Osmosis • Isotonic solution • Same concentration of water and solute http://anaptechno.blogspot.com/2011/04/cell-membrane-structure-and-function.html
Osmosis • Hypertonic solution • Solute concentration greater outside the cell. • Water movesout causing cell to shrink. http://www.innovateus.net/content/when-are-hypertonic-solutions-used
Osmosis • Hypotonic solution • More solute inside the cell. • Water will move into the cell. http://spmbiology403.blogspot.com/2008/08/types-of-solution-hypotonic.html
Active Transport • When substances move against the concentration gradient. • Low to High • Requires carrier proteins and energy (ATP) • also called pumps
Active Transport • Sodium-Potassium pump • uses ATP to pump three sodium ions out while bringing two potassium ions in.
Endocytosis • The cell surrounds a substance on the outside. • “pulls” the substance into the cell. • Requires energy http://sjcabiology.wikispaces.com/Endocytosis
Exocytosis • Removalof materials from the cell • Uses vesicles • Requires energy http://teachernotes.paramus.k12.nj.us/nolan/cp%20bio.htm
Bell Ringer • In the egg experiment, what do you think will happen to the egg placed in corn syrup? • Could it be dangerous to drink too much water? Explain your answer. • In a hypotonic environment, animal cells will swell and often burst. Plant cells will swell, but won’t burst. What cellular structure keeps plant cells from bursting?