24 Some bacteria have Flagella Long, threadlike structures which enable movement.
25 Bacteria are important to all life on Earth. They… Decompose dead things.Fix nitrogen in the atmosphere to make it available to plants.Digest sewage.Break down oil from oil spills.Synthesize medicines.Help animals (including us) digest food.Some cause disease.
26 Copy, color and label the Prokaryotic Cell (p. 472) Period 4 stopped here 9/27/10
27 Eukaryotic Cells Who? Fungi What? Plants AnimalsWhat?True nucleus with nuclear membraneDNA (genes) located in nucleusMembrane-bound organellesComplex structure and functionEvolved 2.5 billion years ago
36 Make a Venn Diagram Comparing and Contrasting Eukaryotes and Prokaryotes
37 Common Features of Eukaryotic and ProkaryoticCells Cell membrane- encloses and protects the cellCytoplasm- interior fluid of cellCytoskeleton – microscopic fibers within cytoplasmRibosomes- structure on which proteins are made (Eukaryotic Ribosomes are larger and more complex)DNA- provides instructions for making protein, regulate cellular activity and reproduce. (Eukaryotic DNA is more complex)
39 Viruses! Not cells… Not alive…. So what are they? A virus is a tiny particle made of nucleic acid (genetic material), protein and sometimes lipids that can only replicate by infecting living cells.Most viruses are composed of a core of either DNA or RNA surrounded by a protein coat called a capsid.Viruses are NOT alive: They don’t grow, develop, or carry out respiration. They do not have organelles or a nucleus.
40 They come in a variety of shapes and sizes. Viruses may have only a few genes or over 100 genes.They come in a variety of shapes and sizes.
41 Viruses enter cells and use the cell to make copies of themselves, often destroying the cell in the process.Lytic Infection- virus enters cell, uses the cell’s energy, makes copies of itself and causes the cell to burst.Lysogenic Infection- virus enters cell, embeds its DNA into the DNA of the host cell and replicates itself- indefinitely or it may switch to the lytic cycle.
42 Viruses cause many human diseases. PolioMeaslesAIDSMumpsInfluenzaYellow feverRabiesThe common coldHerpesHepatitisGenital Warts
43 Bacteria cause many human diseases and problems. TuberculosisStrep throatScarlet feverDiptheriaLyme diseaseTooth decayMeningitisChlamydiaGonorrheaSyphilis
44 Make a Venn Diagram Comparing and Contrasting Cells and Viruses (use page 483 for help!)
45 Key points Prokaryotes have no membrane bound organelles. Eukaryotes have membrane bound organelles allowing for thousands of chemical reactions to occur at once.Viruses are not cells; they consist of only a protein coat surrounding a strand of genetic material, either RNA or DNA.
46 TEST PRACTICE!Eukaryotic cells are different from prokaryotic cells because eukaryotic cellsA are much smaller.B have permeable membranes.C have a higher rate of reproduction.D have nuclei.
47 TEST PRACTICE! Which of these best completes this concept map? A an animal cellB a prokaryotic cellC a virusD a plant cell
48 HOMEWORK:Read 19-1, 19-2 and 19-3 on Bacteria and Viruses and answer the Section Review questions. (15 pts)DUE: TUESDAY!Work on Cell ModelRead 7-1Read 7-2 and Answer Section Review Questions in notebook (5 pts)
49 Eukaryotic Organelle Chart Complete the chart and label the diagrams.
50 Eukaryotic Cell Model 30 points Choose an animal cell or a plant cell.Create a 3-D model of that cell, including all organelles. (15 pts)Either label the model directly or create a key for the model. (5 pts)You will be graded on creativity and likeness (how close it resembles a real cell). (10 pts)For extra credit (10 pts), create a bacterial cell (prokaryote) in addition.