All Organisms are made of Cells -...
Transcript of All Organisms are made of Cells -...
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All Organisms are made of Cells
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Cell History 1.) First become aware of cells in the 1600s when Robert Hooke invented microscope, formed the term “cell”
2.) 10 years later, Anton van Leeuwenhoek used a microscope to view water from a pond
He discovered many living creatures in which he named “animalcules”
–Now we know them as single-celled organisms
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CELL HISTORY
3) Matthias Schleiden 1838 – viewed plant cells Concluded… All PLANTS are
made up of cells 4) Theordor Schwann
1839 – viewed animal cells Concluded… All ANIMALS are made up of
cells 5) Rudolph Virchow
1855 – all cells must develop from other cells
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Cell Theory
Cell Theory (Schleiden, Schwann, & Virchow)
– All living things are made of one or more cells
– Cells are the basic units of structure and function in organisms
– All cells arise from existing cells
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Facts About Cells Cells are the smallest living unit of an organism
All cells contain living material called cytoplasm
All cells are surrounded by a cell membrane that controls what enters & leaves the cell
All cells have ribosomes, which make proteins
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More Cell Facts Cells are complex & highly organized
Cells have parts called organelles that do different jobs
e.g. Chloroplasts in plants make sugars
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More Cell Facts The simplest cells are called Prokaryotes
These cells DO NOT have a nucleus or membrane-bound organelles
Bacteria are examples
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More Cell Facts More complex cells are called Eukaryotes
These cells DO have a nucleus and membrane-bound organelles
Plants, animals, protists, & fungi are examples
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Key Eukaryotic Cell Organelles
Nucleus- holds DNA, control center
Nucleolus- creates ribosomes
Mitochondrion(a)- power house, creates
energy
Endoplasmic Reticulum- transports
proteins from ribosomes to Golgi Body
Golgi Body/Apparatus- transports
proteins out of cell in vesicles copyright cmassengale 9
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Organisms are Grouped by their Number of Cells
Unicellular Organisms – Living Organism Made Up Of One
Cell
Multicellular Organisms – Living Organism Made Up Of
Many, Specialized Cells
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Cells Have a Genetic Code, DNA
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DNA codes for the proteins that make up cells & do all the work
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Life is Organized on Several Levels
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Levels Atoms Molecules Organelles Cells – life starts here Tissues Organs System Organism
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Levels
Population
Community
Ecosystem
Biosphere
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