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yoselin

bio chemistry

TermDefinition
acid any substance that forms hydrogen ions in water & has a pH below 7
atom smalllest particle of an element that has the characteristics of that element
base any substance that forms hydroxide ions in water & has a pH above 7
compound substance composed of atoms of two or more different elements that are chemically combined
covalent bond chemical bond formed when 2 atoms share electrons
element substances that can be broken down into simpler chemical substance
ion atom/group of atoms that gain or lose electrons & has electrical charge
ionic bond chemical bond formed by the attractive forces btw physical & chemical properties
isotope atoms of the same element that have diff. #'s of neutrons in the nucleus
metabolism all chemical reactions that occur within an organism
mixture combnation of substances in which individual comonents retain their own properties
molecule group of atoms held together by covalent bonds & no overall charge
nucleus positive charged center of an atom composed of neutrons & protons & surrounded by - electrons
pH scale measures how acid or basic solution ((from 0 - 14)) solution : above 7 & acidic :below 7
solution mixture in witch 2 substances ((solutes)) are disolved ((solvent))
diffusion random movement of particles of higher concentration to an area of lower concentration ((kool aid in water -stir-))
dynamic equilibrum results of diffusion where theres movement but no change in concentration
hydrogen bond weak - by + charged hydrogen atoms to other - charged atoms
polar molecule unequal distribution of charge = positive end & negative end
amino acid building blocks of protein molecules
carbohydrate organic compound cells used to store & release energy ((carbon,hydrogen and oxygen))
enzyme type of protein found in living things that changes the rate of chemical reactions
isomer compounds w/the same simple formula but diff 3 dimensional structures = physical & chemical properties
lipid organic compounds made of carbon & hydrogen w/small amount of oxygen ex fats & oils
nucleic acid complex biomolecules ((DNA & RNA)) store information in cells in form of a code
peptide bond covalent bond formed btw amino acids
polymer large molecule formed when smalll molecules ((come together)) ''bond''
protein large,complex polymer essential to all life composed of carbon,hydr,oxygen,nitrogen,& sulfur(somtimez) provides structure for tissues & organs && help carry out cell metabolism
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