Chapter 4
acidic
the property of a solution in which the concentration of hydrogen (H+) ions is greater than the concentration of hydroxide (OH-) ions
atoms
the smallest component of an element that maintains the chemical properties of that element
autotrophs
an organism that uses the energy from the sun to produce its own food
basic
the property of a solution in which the concentration hydroxide (OH-) is greater than the concentration of hydrogen (H+) ions
bioremediation
the attepmt to clean up pollution by enhancing natural processes of biodegradation by living organisms
carbohydrates
an organic compound consisting of atoms of carbon, hydrogen, and oxygen
cells
the most organizational unit of organisms
cellular respiration
the process by which a cell uses the chemical reactivity of oxygen to split glucose into its constituent parts, water and carbon dioxide, and thereby release chemical energy that can be used to form chemical bonds or to perform other tasks within the cell
chemical energy
potential energy held in the bonds between atoms
chemosynthesis
the process by which bacteria in hydrothermal vents use the chemical energy of hydrogen sulfide to transform inorganic carbon into organic compounds
compound
a molecule whose atoms are
consumers
covalent bond
A chemical bond formed by the sharing of one or more electrons, especially pairs of electrons, between atoms.
deoxyribonucleic acid (DNA)
nucleic acids that are usually the molecular basis of heredity, are localized especially in cell nuclei, and are constructed of a double helix held together by hydrogen bonds between purine and pyrimidine bases which project inward from two chains containing alternate links of deoxyribose and phosphate
electrons
A stable subatomic particle in the lepton family having a rest mass of 9.1066 ? 10-28 grams and a unit negative electric charge of approximately 1.602 ? 10-19 coulombs.
element
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
energy
entropy
eukaryotic
first law of thermodynamics
fossils
fossil record
genes
geothermal energy
half-life
heterotrophs
hydrocarbons
ionic bond
ionic compounds
ions
isotopes
kinetic energy
lipids
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