| A | B |
|---|
| biology | science of life |
| organism | individual living thing |
| homeostasis | the balanced state in cells |
| hypothesis | possible explanation or guess |
| acid | compound that donates H+ ions |
| atom | smallest unit of a chemical element |
| catalyst | substance that speeds up a chemical reaction without itself being used up in the reaction |
| ion | charged particle formed by an atom that has gained or lost one or more of its electrons |
| control | in an experiment, the test group in which the variable is not altered |
| experiment | controlled test to determine the validity of a hypothesis |
| science | process of thinking and learning about the world around us |
| scientific method | system used to solve a problem |
| theory | the best explanation that science can currently give |
| variable | factor that differs among the test groups in an experiment and is measured against a control |
| active site | region a an enyme where a substrate binds |
| amino acid | molecule of which proteins are made |
| base | compound that donates OH- ions or accepts H+ ions |
| carbohydrates | class of macromolecules that includes sugars and starches; source of chemical energy |
| chemical compound | substance formed by the bonding of atoms of different elements in definite proportions |
| chemical reaction | process that changes one set of substances into a new set of substances |
| covalent bond | atoms share electrons to satisfy outer orbits |
| enzyme | molecule that serves as a catalyst in organic reactions |
| electron | subatomic particle that carries a negative charge |
| inorganic compound | a compound that contains that does not containcarbon chains |
| ionic bonds | attraction between oppositely charged ions |
| lipid | waxy, fatty, or oily compound used to store and release energy |
| macromolecule | large organic polymer, such as carbohydrate, lipid, protein, or nucleic acid |
| molecule | group of atoms united by a covalent bonds |
| monomer | small, individual molecule that forms a polymer |
| neutron | subatomic particle that carries no charge |
| nucleic acid | DNA and RNA that consists of neucleotides and genetic information |
| organic compound | a substance that contains a chain of at least two carbon atoms |
| pH scale | measurement system that indicates the acidity or basicity of a solution |
| polymer | large molecule assembled from small, individual molecules |
| protein | polymer of amino acids used for building cells, catalyzing reactions, and other purposes |
| proton | subatomic particle that carries a postive charge |
| solution | uniform mixture of substances |
| substrate | the component that binds to an enzyme |
