Transcript THE CELL
THE CELL • Cells are mainly formed of water, but present in their structure are proteins, carbohydrates, and nucleic acids (DNA). Structure • Cell membrane • Cell wall • Nucleus THE CELL Cell Membrane • Separates the parts inside the cell from the outside • Support for the cytoskeleton, shape for the cell • Substances pass through it • Cell communication THE CELL Cell Wall • Strength and rigidity • Protection • Retains water • It is different between eukaryotes and prokaryotes and plants and fungi THE CELL Workshop • Make a scheme where you compare all the different types of cells there are. • List the differences between the cell wall and the cell membrane HOMEWORK: Bring information about the cell organelles and its functions. In groups: classify the organelles of the cell according to the processes related to their functions. THE CELL ANIMAL CELL http://www.enchantedlearning.com/subjects/animals/cell/ THE CELL PLANT CELL http://www.enchantedlearning.com/subjects/plants/cell/ THE CELL Organelles • In groups: – Each member of the group brings information of the cell’s organelles and their function. – Discuss about how those organelles and structures influence the function of the cells. Write your conclusions. – Make a scheme or model of a plant and animal cell indicating all its organelles and functions. THE CELL - Transport Cell Membrane Phospholipids have both hydrophilic and hydrophobic regions: nonpolar tails (hydrophobic), polar heads (hydrophilic) THE CELL - Transport Cell Membrane It also has proteins in the membrane, which function is regulate the movement of some substances THE CELL - Transport Release wastes and take in some substances PASSIVE TRANSPORT Cell membrane: acts as selectively permeable screen. Movement of molecules between areas of different concentrations THE CELL - Transport PASSIVE TRANSPORT: no energy is needed • Diffusion: movement of molecules -like oxygen- from areas of high concentration to areas of low concentration. • Osmosis: movement of WATER through a semipermeabe membrane from areas of lower concentrations to areas of higher concentrations. THE CELL - Transport Solutions can be: Isotonic: same concentrations, there is an equilibrium Hypotonic: lower concentrations of dissolved solutes on the outside, therefore water moves into the cell Hypertonic: higher concentrations of dissolved solutes on the outside, therefore water moves out of the cell THE CELL - Transport THE CELL - Transport Active Transport: energy is needed Allows the movement of molecules from an area of low concentration to an area of high concentration. THIS REQUIRES ENERGY!! sodium - potassium pump Endocytosis: membrane surrounds the molecule that is going to be taken inside… Exocytosis: membrane surrounds the molecule that is going to be pushed outside… THE CELL Presentations: PHOTOSYNTHESIS, RESPIRATION, FERMENTATION Instructions: 1.Explain the process 2.Prepare an activity related to the topic References • • • • http://library.thinkquest.org/3564/ http://www.cellsalive.com/cells/cell_model.htm http://www.biologycorner.com/bio1/diffusion.html# https://docs.google.com/a/clermont.edu.co/present/vi ew?id=dfh23k67_3097ckdwv8d5