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| the elements or compounds that enter into a chemical reaction |
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| elements or compounds that enter into a chemical reaction |
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| factor in whether the overall chemical reaction releases energy or absorbs energy |
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| is a substance that speeds up the rate of a chemical reaction |
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| are proteins that act as biological catalysts |
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| the reactants of enzyme-catalyzed reactions |
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| the basic unit of all living things |
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idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells |
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| 1665, english scientist observed cork under a microscope and used the term cell to describe what he saw |
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| used a single-lens microscope to observe pond water and other things. To his amazement, the microscope revealed a fantastic world of tiny living organisms |
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| concluded that all plants were made of cells |
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| stated that all animals were made of cells |
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| German physician concluded that new cells could be produced only from the division of existing cells |
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the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities |
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unicellular organism lacking a nucleus |
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organism whose cells contain nuclei |
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| the part of the cell that gives the cell shape and hold the cytoplasm |
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