Unit1: Cell functions/ Cell division Cells Cell theory: -All living things are composed of one or more cells. -The cell is the smallest entity that retains the properties of life. -New cells arise only from cell that already exists. Structure of the cell: The outer boundary (plasma membrane) similar to a city wall It is constructed with molecules called lipids (fat and oils) The cell membrane is composed of: -Proteins and Lipids -FUNCTION: to allow molecules into and out of the
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Temp. gets better it germinates and continues its growth Eukaryotic Cells: True nucleus Cytoplasm: stuff inside the plasma membrane & outside nucleus Cytosol: Fluid portion of cytoplasm Cytoskeleton: Microfilaments‚ intermediate filaments‚ microtubules Cytoplasmic streaming: Movement of cytoplasm throughout cells Organelles Nucleus: Has chromosomes ER: Transport network Golgi
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vacuole is a fluid-filled sac used for the storage of materials needed by a cell. | | Lysosomes | The lysosomes are membrane-bound organelles that contain enzymes. | | Centrioles | Centrioles are cylinder-shaped organelles made of short microtubules arranged in a circle. | | Cell Wall | The surrounding of a cell membrane in a plant cell. It is a rigid layer that gives protection‚ support‚ and shape to the cell. | | Chloroplasts | Chloroplasts are organelles that carry out photosynthesis
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In: Health‚ History‚ Politics & Society‚ Environmental Issues [Edit categories] Climate Crisis Reality www.climaterealityproject.org/RSVP | Polluters want to keep us in the dark. See the video‚ get the truth. | CSA Environmental www.csaintl.com | Marine Environmental Services - GIS Mapping - Surveys - Assessments | Ads Answers.com > Wiki Answers > Categories > Health > What is positive human impact on the environment? Answer: Improve Positive human impacts are generally
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3A The Structure of Cells Monday‚ September 30‚ 2013 • Cytology ○ Cyto = cell ○ Logos = study of • Background ○ 1665 Robert Hook’s Micrographia § Was studying cork cells ○ 1833 R. Brown § Discovered nucleus ○ 1838 M. Schleiden § Said that all plants consist of cells ○ 1839 T. Schwann § All animals consist of cells ○ 1855 Virchow § Cells come only from preexisting cells • The Cell Theory ○ Cells are the structural units of all living things
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Cell Fractionation * Cell Fractionation: takes cells apart and separates the major organelles and other subcellular structures from one another. * Tissue cells are the first one to be homogenate or broken apart. * Plasma membranes are broken up so that there internal contents spill out and mix together and this is called homogenate. * Homogenate is in spun in a higher rate of speed in a process called centrifugation. And that speed can vary that why it’s called differential
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1. The electron microscope has been particularly useful in studying prokaryotes‚ because electrons can penetrate tough prokaryotic cell walls. ~prokaryotes are so small. prokaryotes move so quickly they are hard to photograph. their organelles are small and tightly packed together. 2. Which of the following terms is most closely associated with "resolving power"? ~Clarity Larger size Greater color Lighter image 3. The person who first used the term cell to describe the basic
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the following organelles. |M___ Membrane separating the contents of the nucleus from the rest of the cell |a. cilia | |J___ Protein synthesis |b. microtubules | |L___ Helps in animal cell division |c. lysosomes | |E___ Contains DNA |d. mitochondria
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structures based on the outside of cells that help move fluid. Behe argued that within the structure‚ there are many little components within that allow the cilium to function. Behe had said that if the cilium did not have a motor protein‚ the microtubules in the cilium would not slide and it would
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all of the organelles are positioned. I compared this to the actual hospital building‚ because though the building is not a liquid‚ it is where all of the people are "positioned‚" or where they all work. The centrioles are rings of 9 groups of microtubules. They are part of the cytoskeleton. They help make the cell expand. I compared this to the architects and construction workers who expand the hospitals. Centrosomes are made up of centrioles‚ and they are even bigger on cell expansion. I compared
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