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The Cell Theory
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Organization of Matter
Atoms- smallest unit of matter Examples: Carbon, Hydrogen, Oxygen Atoms come together to form…
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Organization of Matter
Molecules- such as water, glucose,DNA Molecules come together to form…
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Organization of Matter
Cells- smallest unit of life Cells come together to form…
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Organization of Matter
Tissues- such as nervous tissue, muscle or bone Tissues come together to form…
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Organization of Matter
Organs- such as heart, brain, or stomach Organs come together to form…
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Organization of Matter
Organ systems- such as cardiovascular or nervous systems Organ systems come together to form…
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Organization of Matter
Multicelled organisms- such as: plants, animals, fungi, humans
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The History of Cell Discovery
Early 1600’s Galileo- 1st to record observations of magnified objects insect eyes
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The History of Cell Discovery
1665 Robert Hooke- observed cork “dead cells filled with juices” Used the word “cell”- from the little rooms that monks lived in
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The History of Cell Discovery
1670 van Leeuwenhoek observed living cells with microscope Looked at pond water-”animalcules”
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The History of Cell Discovery
1820 Robert Brown observed spherical structure in cells “nucleus”
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The History of Cell Discovery
1839 Schleiden observed plants under the microscope All plants were made of cells
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The History of Cell Discovery
1839 Schwann observed animals under the microscope All animals were made of cells
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The History of Cell Discovery
1850 Virchow observed cells under the microscope grow in size and divide in 2 cell division
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The History of Cell Discovery
1950 Electron Microscope Magnifies 500,000x Beam of electrons Observe structures inside cells Virtual Electron Microscope
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The Cell Theory The observations and conclusions of these and other scientists led to the development of The Cell Theory: All organisms are made of one or more cells. The cell is the basic unit of life. All cells come from pre-existing cells
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All Cells Have in Common:
1. Plasma membrane- boundary 2. Cytoplasm-water and dissolved molecules Genetic material- DNA Ribosomes – the site of protein synthesis
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Two Cell Types understanding size
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Two Cell Types 1. Prokaryotes: Simpler
Genetic material is not contained in a nucleus. No organelles Ex. Bacteria
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2. Eukaryotes More complex Genetic material contained in a nucleus
Organelles- Allow different parts to perform different functions Ex. Animal, plant, fungi and protist cells.
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Eukaryotic Cell Structure
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