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cellsµscopes
test
17
Science
8th Grade
12/04/2011

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Term
compound light microscope
Definition
 uses light focussed through several different lenses to form a magnified image of a speciman.
Term
cell
Definition
 is the basic structural unit of an orginisam and the building block of life.
Term
cell theory
Definition

1.the cell is the unit of life in other words the cell is the smallest living orgisim that shows charecteristics of other living things.

2.an orginim can be as simple as 1 cell (unicellular) or as complicated as thousands(multicellular)

3.all cells are created by other cells through the process of cell division. by which a cell divides into 2 new cells

 

Term
unicellular
Definition
an orginism with 1 cell
Term
multi cellular
Definition
an orginim made up of more than one cell
Term
cytoplasm
Definition
a jelly like material in which the parts of a cell floats
Term
cell membrane 
Definition
 is a a thin covering that keeps the cytoplasm together 
Term
organelles
Definition
 are tiny parts within a cell that help the cell survive, grow and reproduce, most organelles have membranes of their own.
Term
organelle membrane
Definition
keeps different parts of the cell from touching each other.
Term
the main difference between animal and plant cells
Definition
plant cells have a cell wall
Term
micrographs 
Definition
are photos taken with a microscope.
Term
permable
Definition
means water and air can pass through quickley
Term
impermeable 
Definition
water can not pass through
Term
selective permeability
Definition
the barrier that only allows certain substances to pass through it.
Term
diffusion 
Definition
is the movment of particles from an area which is high concentrated ( there are many of them) to an adjoining area that is low concentrated (there are few of them). this process continues until each has the same amount of particles
Term
osmosis 
Definition
is a special kind of diffusin that involves only the movment of water through a selectively permeable membrane
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