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Molecules
Molecules and the Cell Theory
Term | Definition |
---|---|
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. |