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16 terms

Life Science Review - Chapter 3

SAS 7th Grade Midterm
STUDY
PLAY
Atom
smallest unit of matter; substance that cannot be broken down
Element
something made up of only one kind of atom
Compound
substance made up of two or more elements
Mixture
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
Diffusion
type of passive transport where molecules from an area where there are relatively more into an area where there are relatively few
Osmosis
diffusion of water through a cell membrane
Active Transport
movement of substances through a cell membrane tat needs input of energy
Endocytosis
taking substances into a cell by surrounding it with the cell membrane; done when the molecule is too big to diffuse
Exocytosis
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
Photosynthesis
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
Fermentation
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