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Definition
| The goal of science is to investigate and understand the natural world, to explain events in the natural world, and to use those explinations to make useful predictions. |
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| Setting up a controlled Experement |
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Definition
| Whenever possible, a hypothesis should be tested by an exsperement in which only one variable is changed at a time. All other variables should be kept unchanged or controlled. |
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| Characteristics of Living Things |
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Definition
-Made up of cells
-reproduce
-based on DNA
-grow and develop
-obtain and use things for energy
-respond to enviroment
-maintain stable internal enviroment
-change over time |
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| Some of the levels at which life can be studied include (smallest to largest) molecules, cells, groups o, population, community, Ecosystem, Biosphere. |
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| COmmon Measurement system... |
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Term
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| Light Microscopes produce magnified images by focusing visible light rays. Electron microscopes produce magnified images by focusing beams of electrons. |
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Definition
| The subatomic particles that make up atoms are protons, neutrons, and electrons. |
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| Because they have the smae number of electrons, all isotopes of an element have the smae chemical properties. |
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Definition
| The main types of chemical bonds are ionic bonds and covalent bonds |
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Definition
| a water molecule is polar because there is an uneven distribution of electrons between the oxygen and hydrogen atoms |
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Term
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Definition
(Bases) basic acid or alkaline soulutions contain lower concentrationsof H+ ions than pure water and have pH values ABOVE 7
(Acids) Acidic soulutions contain higher concentrations of H+ ions than pure water and have pH value BELOW 7
** 0=more acidic, 14= less acidic** |
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Definition
| Four groups of organic compounds found in living things are carbohydrates, lipids, nucleic acids, and proteins. |
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Definition
Living things use carbohydrates as their main source of energy, plants and some animals also use carbohydrates for structural porpouses.
(starches,and sugars) |
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Definition
| Lipids can be used to store energy. SOme lipids are important parts of biological membrances and waterproof covering. |
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Definition
Nucleic Acids store and transmit hereditary or genetic information.
(RNA and DNA) |
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Definition
| some proteins control the rate of reactionand regulate cell processes. some are used to form bones and muscles. Others transportsubstancesinto or out of cells or help fight disease. |
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Definition
| Chemical reactions always involve the breaking of bondsin reactants and the formation of new bonds in products. |
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Definition
| chemical reactions that releaseenergy often occur spontaneously. chemical reactions that absorb energy will not occur without a source of energy. |
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Definition
| Enzemes speed up chemical reactions that take place in cells. |
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