Biology study guide 1 - Properties of Life ORGERRE Order...

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Properties of Life: ORGERRE Order Regulation Growth Energy Response Reproduction Evolution Levels of Life: BECPOOTCOM Biosphere Ecosystems Communities Population Organisms Organ Tissues Cells Organelles Molecules Ecosystems: Energy comes from down from the sun and the grass absorbs it, then the animals eat the grass and send out heat energy Prokaryotic Cell: Small simple cell, often found in bacteria Eukaryotic Cell: Bigger more complex cell, contains many types of organelles Scientists have identified 1.8 million types of species, and there are expected to be 10 to 100 million total species Three Domains of Life Bacterica, Archaea, and Eukarya Prokaryotes: -Domain Bacteria -Domain Archaea Eukaryotes: -Domain Eukarya -Plantae Kingdom -Fungi Kingdom -Animalia Kingdom -Protists Chapter 2 Fluoride in Water: Fluoride helps prevent cavities in two ways
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-Its affects the metabolism of oral bacteria -Promotes the replacement of lost minerals on the surface of teeth Common ingredient in Earth’s crust Helps maintain healthy teeth Most common element in the human body is Oxygen Followed by Carbon, Hydrogen, then Nitrogen There are 25 elements that are essential to life Even the elements that are in small amounts are just as important as the large amounts The elements that are needed in smaller amounts are called the trace elements Substances that contain two or more elements are called compounds (H2O, NaCl) Atoms: Every element consists of one type of atom Atoms contain: Protons: Positive charge Neutrons: Neutral Charge Electrons: Negative Charge All elements differ in the number of subatomic particles in their atoms The number of protons in an atom is the Atomic Number Mass number is the sum of the number of protons and neutrons Isotopes A radioactive isotopes are ones in which the nucleus decays, giving off particles and energy They have many uses in biological studies and medicine Uncontrolled exposure to them can cause harm to living organisms Electron Arrangement and the Chemical Properties of Atoms Electrons control how an atom will react when it encounters another atom Electrons can vary in the amount of energy they possess.
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