cells cell type & structure [7.1, 7.3]. spi 2 distinguish between prokaryotic and eukaryotic...
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CellsCell Type & Structure [7.1, 7.3]
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• SPI 2 Distinguish between prokaryotic and eukaryotic cells.
Goals:
• Review the differences between prokaryotes and eukaryotes
• Identify the best and the second best way to tell a prokaryote from a eukaryote
Cell Types- Part 1
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Part 1 Agenda1. Research Teams navigate to:
http://www.ck12.org/biology/Prokaryotic-and-Eukaryotic-Cells/
2. “Read: Prokaryotic and Eukaryotic Cells”, take your own notes on the differences between them.
3. If you finish before we’re ready to share, go to the website below and do the interactive: http://www.wiley.com/legacy/college/boyer/0470003790/animations/cell_structure/cell_structure.htm
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Cell Structures- Part 2
• SPI 1 Identify the cellular organelles associated with major cell processes.
Goals:
• Understand how sets of organelles work together to do essential jobs inside the cell that you need to happen to keep on ticking.
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Part 2 Agenda
1. Research teams: Choose a process/job from those listed on the board and claim it by writing your group’s name on the board next to it.
2. Research your process using the outline I will provide you.
3. Share your research/describe your process with the class.
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Processes (to be written on board):
•Protein Synthesis
•Plant Metabolism
•Animal Metabolism
•Structure, Support, & Movement
•Storage and Waste Disposal
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Cell Types
• Eukaryotic Cells (Eukaryotes)• Found in complex lifeforms where efficiency and
communication between cells is critical
– Have a nucleus• Centralized command center• Safe-house for DNA
– Have organelles• Specialized structures where specific jobs are
performed
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Cell Types• Prokaryotic Cells (Prokaryotes)
• Simplest form of life, most closely resembles earliest life on Earth
– Do not have a nucleus– Do not have organelles
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Cell Types• Plant v. Animal
– Chloroplasts: Plants are the only organisms that have them.
– Cell Wall: Animals don’t have cell walls, but plants and bacteria do.
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Plant
Cell Types
Animal
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Cell Structure
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Cytoplasm• The cytoplasm is the fluid that fills
the inside of a cell.– In prokaryotes all cell functions take place in
the cytoplasm– In eukaryotes organelles are suspended in
the cytoplasm, and cell functions take place inside them instead.
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Cytoskeleton• The cytoskeleton is a network of protein fibers
inside the cell.– Provides structural support for the cell
(microfilaments)• Holds organelles in place
– Provides transportation infrastructure (microtubules)
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Cytoskeleton• Centrioles
– Made of microtubules– Used during mitosis to help cell divide
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Cytoskeleton• Cilia and Flagella
– Made from microtubules– Cilia:
• Small and hair-like, numerous• Work like oars on a boat for short distance
movement or like a filter (intestines)
– Flagella• Larger and fewer than cilia• Used for faster, long distance movement
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Nucleus
• The cell’s command center.
• Houses genetic info: DNA. Nuclear DNA can never leave the nucleus.
• Nuclear pores control passage between inside and outside
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Endoplasmic Reticulum (ER)
• Folded membrane bound structure found around the nucleus
• Two parts:– Rough ER: has ribosomes, and is the
location of protein synthesis.– Smooth ER: no ribosomes, site of
carbohydrate and lipid synthesis.
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Page Title
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Ribosomes
• A protein that manufactures other proteins
• Concentrated on the Rough ER
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Golgi Apparatus
• Modifies, sorts, and packages proteins into sacs called vesicles for transport to their destination
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Mitochondria
• Converts food (mainly sugar) into energy.
• Has two membranes, and outer membrane and a highly folded inner membrane for large surface area.
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Chloroplasts
• In plant cells ONLY
• Trap sunlight and convert it to chemical energy in a process called photosynthesis.
• Contain thylakoids which have chlorophyllgreen plants
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Lysosomes
• Vesicles which contain digestive enzymes to destroy waste, worn out organelles, and bacteria/viruses.
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Vacuole
• Membrane bound vesicles where waste products and materials are stored.
• Usually NOT in animal cells, but large in plant cells.
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Cell Wall
• Is a thick rigid mesh of fibers surrounding the plasma membrane
• In plant cells, some fungi and bacteria
• Made of Cellulose which is inflexible and allows plants to stand tall.
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