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SAS 7th Grade Midterm


smallest unit of matter; substance that cannot be broken down


something made up of only one kind of atom


substance made up of two or more elements


combination of substances in which individual substances retain their own properties; can be separated; Example: Chex Mix

Organic Compounds

contain carbon and hydrogen; usually associated with living things

Inorganic Compounds

made from elements other than carbon

Passive Transport

movement of substances through a cell membrane without input of energy


type of passive transport where molecules from an area where there are relatively more into an area where there are relatively few


diffusion of water through a cell membrane

Active Transport

movement of substances through a cell membrane tat needs input of energy


taking substances into a cell by surrounding it with the cell membrane; done when the molecule is too big to diffuse


a vesicle filled with molecules fuses with the cell membrane and the contents are released to the outside

Facilitated Diffusion

Large molucules are diffused through a cell membrane with the help of transport proteins


producers use light energy to make sugar that can be used as food; plants do this

Cellular Respiration

chemical reactions break down food molecules in to simple substances and release their stored energy


oxygen lacking cells and single cell organisms release small amounts of energy from sugar molecules and produce wastes like alcohol, carbon dioxide and lactic acid

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