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Chap 3 - Science

7th Grade Science Chapter 3 - Cell Processess

mixture a combination of substances in which the individual substances do not change or combine chemically but instead retain their own individual properties; can be gases, solids, liquids or any combination of them.
organic compound compounds that always contain hydrogen and carbon; carbohydrates, lipids, proteins, and nucleic acids are organic compounds found in living things
enzyme a type of protein that regulates nearly all chemical reactions in cells; a type of protein that speeds up chemical reactions in the body without being changed or used up itself
inorganic compound compound, such as H2O that is made from elements other than carbon and whose atoms usually can be arranged in only one structure
passive transport movement of substances through a cell membrane without the use of cellular energy; includes diffusion, osmosis, and facilitated diffusion
diffusion a type of passive transport in cells in which molecules move from areas where there are more of them to areas where there are fewer of them
equilibrium occurs when molecules of one substance are spread evenly throughout another substance
osmosis a type of passive transport that occurs when water diffuses through a cell membrane
active transport energy-requiring process in which transport proteins bind with particles and move them through a cell membrane
endocytosis process by which a cell takes in a substance by surrounding it with the cell membrane
exocytosis process by which vesicles release their contents outside the cell
metabolism the total of all chemical reactions in a organism
photosynthesis process by which plants and many other producers use light energy to produce a simple sugar from carbon dioxide and water and give off oxygen
cellular respiration process by which producers and consumers release stored energy from food molecules; series of chemical reactions used to release energy stored in food molecules
fermentation process by which oxygen-lacking cells and some one-celled organisms release small amounts of energy from glucose molecules and produce wastes such as alcohol, carbon dioxide and lactic acid
Created by: dcaeschliman