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14 Cards in this Set
- Front
- Back
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ROBERT HOOKE |
-introduced the word cell to science -discovered cellular composition of the cork -invented compound microscope |
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Anton Van Leeuwenhoek |
- first to observe protozoa and bacteria -improved the microscope |
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Matthias Schleiden |
-discovered plants and their different parts are made of cells |
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Rudolf Virchow |
-found that cells come from existing cells |
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Theodor Schwann |
-proved the cellular origin -declared that all living things are composed of cells and cell products |
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Cell Theory |
1. All living things are composed of cells 2. Cells are the basic units of structure and function in living things 3. New cells are produced from existing cells |
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Light Microscopes |
-light passes through 2 lenses - objective lens - ocular lens -magnifies by 1000 -need to use dyes and stains |
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Electron Microscopes |
-see objects 100 million times smaller -use beams of electrons focused at magnetic fields -can only be used on nonliving cells and tissues -expensive and large |
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Basic Cell Structure |
1. cell membrane 2. genetic info (DNA) 3. cytoplasm |
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Prokaryotes |
-do not separate their genetic material within a nucleus -no other membrane bound organelles -smaller, simpler |
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Eukaryotes |
-have a membrane that separates DNA from the rest of the cell (nucleus) -contains other membrane-bound organelles -can be either single-celled or multi-cellular -plant or animal cells |
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Nucleus |
-control center -contains DNA Nuclear Envelope- Double membrane Nuclear Pores- let info in and out Nucleolus- where ribosome assembly begins |
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Cytoplasm |
-portion of the cell outside the nucleus -thick, jellylike solution -contains all of the cell organelles |
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Cytoskeleton |
-protein filaments that help maintain cell shape and movement Microfilaments- made of acitin, help cells move Macrofilaments- hollow, made of tubulins, maintain cell shape |
