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Molecules and the Cell Theory

significance of the microscope allowed scientists to view and study cells
tissues in multicellular organisms, groups of cells that work together
models of atoms are constantly changing because scientists continue to gain better understanding of their structure
The Cell Theory All living things (organisms) are made of cells, all cells come from other cells, all cells carry on life activities
organisms living things
cell the basic unit of living things
virus nonliving; a sub-microscopic infectious agent that is able to grow or reproduce only within a host cell
bacteria (bacterium) a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease
cell membrane all cells have this; the boundary that surrounds a cell and controls which substances can enter or leave the cell
scientific theory explanation that has been confirmed by observations made by many scientists
Schleiden observed plants under the microscope and realized that all the different parts of plants were made of cells
Schwann studied animals and realized that all the different parts of animals were made of cells
Remak/Virchow watched cells divide and proposed that cells arose from other cells
molecule two or more atoms joined together
symbol a code for a chemical element
periodic table the chart scientists use to organize and classify all the known elements
subscript The numbers appearing small and to the right in the chemical formula ,which indicate the number of atoms of the element immediately before. If none appears, one atom of that element is present.
matter material that has mass and takes up some amount of space
element a pure substance that cannot be broken down into simpler substances by chemical reactions
molecular relating to or consisting of molecules.
Created by: ledee.workman



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