Biology
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| organelle | one of the small bodies that are found in the cutoplasm of a cell and that are specialized to perform a specific function
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| nucleus | in physical science, an atom's central region which is made up of protons and neutrons
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| eukaryote | an organism made up of cells that have a nucleus enclosed by a membrane multiple chromosomes and a mitotic cycle; eukaryotes include animals, plants and fungi, but not bacteria or archara.
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| prokaryote | An organism lacking a nucleus and other membrane-bounded compartments.
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| cells are limited in size by the | rate at which substances eneded by the cell can enter the cell through its surface
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| the diameter of most plant and animal cells is about | 10 to 50 um
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| the characterisitic of a nerve cell that relates directly to its function in receiving and transmitting nerve impulses is its | long extensions
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| one difference between eukaryotic and prokaryotic cells is that only | eukaryotic cells have membrane-bound organelles.
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| two features of ekaryotic cells that prokaryotic cells lack | membrane-bound nucleus and membrane-bound organelles
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| how is the shape of a skin cell suited to its function? | its flat and plate like, and covers and protects the surgace of the body.
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| cell | in biology, the smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm.
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| cell theory | the theory that states that all living things are made up of one or more cells, that cells are the basic units of structure and function in an organism, and cells come only from the reproduction of existing cells.
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| Early piece of evidence that supports cell theory | cells come from other cells
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| the scientist who described cells as "many little boxes" was | Robert Hooke
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| Living and nonliving things are different in that only | living things are made of cells.
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| microscopes were used to study cells beginning in the | 17th century
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| the advantage of van Leeuwen hoek's microscopes was that | the lenses were ground very precisely
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| a light microscope uses optical lenses to magnify objects by | bending light rays
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| Anton Van Leeuwen Hoek | 1680'- pond water, "Wee beesties"
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| Henry Dustrochet | 1824-All living things made of cells
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| Robert Brown | 1831- round body in plant cell "nucleus"
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| Matthias Schleiden | 1839- plants made of cells
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| Johannes Purkinje | 1841- Jellylike material "protoplasm"
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| Rudolph Virchow | 1855- cells from cells (cell division)
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| Max Schultze | 1861- protoplasm "Physical basis of Life" in all cells.
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| Felix Dujardin | 1861- recognized exsistence of one-celled organisms
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| Cell Diversity | cells function influences its physical features
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| Nerve | long extensions send receive impulses
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| skin | flat, plate like
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| plant | rectangular
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| bacteria | rod shape
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| egg | spherical
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| prokaryotic cells(size) | 1-10 micrometers in diameter
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| Eukaryotic cells(size) | 10-100 micro-meters diameter
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