| A | B |
|---|
| atom | smallest part of an element that still shows the properties of the element |
| atomic number | number of protons in an element |
| acid | releases hydrogen ions when dissolved in water |
| molecular formula | shows the kinds and ratios of atoms in a compound |
| covalent bond | bond is formed when atoms share electrons |
| element | substance composed of only one type of atom |
| ion | a charged atom |
| isotope | atoms of the same element that have different atomic masses |
| ph | measures the concentration of hydrogen ions in a solution |
| reactants | substances that participate in a chemical reaction |
| activation energy | energy need to start a chemical reaction |
| amino acid | subunits that form proteins |
| carbohydrate | organic compound is used mostly for energy |
| catalyst | substance that speeds up a chemical reaction |
| cholesterol | steroid used to form the hormones testosterone and estrogen |
| genes | units of heredity |
| hydrogen bond | bond formed by polar molecules attraction |
| macromolecules | the very large organic molecules found in living tissue |
| mass number | sum total of protons and neutrons in an atom |
| nucleotides | subunits of the nucleic acids |
| phospholipid | phosphorous containing lipids of the cell membrane |
| proteins | organic compound has the most different kinds of functions and is composed of carbon, hydrogen, oxygen, and nitrogen |
| replication | process by which a dna molecule can make an exact copy of itself |
| starch | storage polysaccharide found in plants |
| translation | process by which messenger RNA and transfer RNA form a protein |
| thymine | nitrogen base always pairs with adenine in dna |
| adenine | nitrogen base always pairs with uracil in rna |
| cytosine | nitrogen base always pairs with guanine in both dna and rna |
| atomic nucleus | contains the protons and neutrons |
| atomic symbol | one or two letter abbreviations used to represent element |
| base | substance that releases hydroxide ions when dissolved in water |
| structural formula | represent the positions of atoms in a substance |
| compound | sunstance composed of two or more different kinds of elements |
| electron | negative particle found in an atom |
| inorganic compound | compound that does not contain carbon hydrogen and oxygen together |
| ionic bond | bond is formed by the transfer of electrons |
| neutron | neutral particle in an atom |
| organic compound | compound composed of carbon hydrogen and oxygen together |
| proton | positive particle in an atom |
| molecular formula | used to represent the types and ratios of atoms found in a substance |
| active site | area of an enzyme that binds with the substrate |
| dna | genetic material of all organisms |
| enzyme | biological catalyst |
| glucose | sugar is used by all organisms in the process of respiration |
| lipid | organic compound stores the most energy and is used to form cell membranes |
| molecule | smallest part of a compound that still retains the properties of a compound |
| nucleic acid | kind of organic molecules that form dna and rna |
| products | the materials that are formed by a chemical reaction |
| rna | nucleic acid found in both the nucleus and cytoplasm of cells |
| transcription | process by which DNA copies its genetic code into a molecule of messenger RNA |
| adenine | nitrogen base always pairs with thymine in dna |
| uracil | nitrogen base always pairs with adenine in rna |
| guanine | nitrogen base always pairs with cytosine in both dna and rna |
| cytosine | nitrogen base that always pairs with guanine in both dna and rna |
