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| 7174677828 | Acid | compound that donates a proton (H+) when dissolved in a solution. | 0 | |
| 7174677829 | Adhesion | force of attraction between different kinds of molecules |  | 1 |
| 7174677830 | Antiparallel | The opposite arrangement of the sugar-phosphate backbones in a DNA double helix. The opposite arrangement of the sugar-phosphate backbones in a DNA double helix. |  | 2 |
| 7174677831 | Archaea | Microorganisms that live in extreme environments. (resemble bacteria but are not bacteria) |  | 3 |
| 7174677832 | Atom | The smallest particle of an element |  | 4 |
| 7174677833 | Atomic Mass | Number of protons and neutrons |  | 5 |
| 7174677834 | Atomic Nucleus | An atom's dense central core, containing protons and neutrons. An atom's dense central core, containing protons and neutrons. |  | 6 |
| 7174677835 | Atomic Number | | 7 | |
| 7174677836 | ATP (Adenosine Triphosphate) | main energy source that cells use for most of their work, energy currency for life |  | 8 |
| 7174677837 | Base | A substance that decreases the hydrogen ion concentration in a solution. | 9 | |
| 7174677838 | Buffer | mixtures that can react with acids or bases to keep the pH within a particular range |  | 10 |
| 7174677839 | Calorie | Amount of energy needed to raise temperature 1 gram of water 1 degree C |  | 11 |
| 7174677840 | Catalyst | substance that speeds up the rate of a chemical reaction |  | 12 |
| 7174677841 | Celsius | the metric temperature scale in which water freezes at 0 degrees and boils at 100 degrees. |  | 13 |
| 7174677842 | Chemical Bond | the attractive force that holds atoms or ions together |  | 14 |
| 7174677843 | Chemical Equilibrium | the rate of formation of products equals the rate of formation of reactants |  | 15 |
| 7174677844 | Chemical Reaction | A change in which one or more substances are converted into new substances. |  | 16 |
| 7174677845 | Chitin | Polysaccharide found in arthropod exoskeletons and fungal cell walls. |  | 17 |
| 7174677846 | Cis/Trans Isomer | Cis-trans isomers are stereoisomers, that is, pairs of molecules which have the same formula but whose functional groups are rotated into a different orientation in three-dimensional space. |  | 18 |
| 7174677847 | Cohesion | Attraction between molecules of the same substance |  | 19 |
| 7174677848 | Compound | A substance made up of atoms of two or more different elements joined by chemical bonds |  | 20 |
| 7174677849 | Controlled Experiment | An experiment in which only one variable is manipulated at a time. |  | 21 |
| 7174677850 | Covalent Bond |  | 22 | |
| 7174677851 | Deoxyribonucleic Acid | (DNA) nucleic acid that contains the sugar deoxyribose |  | 23 |
| 7174677852 | Double Bond | a covalent bond produced by the sharing of two pairs of electrons between two atoms |  | 24 |
| 7174677853 | Double Helix | The shape of a DNA molecule |  | 25 |
| 7174677854 | Energy | the ability to do work the capacity to cause change |  | 26 |
| 7174677855 | Enzyme | protein catalyst that speeds up the rate of specific biological reactions |  | 27 |
| 7174677856 | Essential Element | A chemical element required for an organism to survive, grow, and reproduce |  | 28 |
| 7174677857 | Eukaryotic Cell | cell that has a nucleus and other membrane-bound organelles. cell that has a nucleus and other membrane-bound organelles. |  | 29 |
| 7174677858 | Evaporative Cooling | A property of water whereby a body becomes cooler as water evaporates from it. |  | 30 |
| 7174677859 | Evolution | The process through which species change over time |  | 31 |
| 7174677860 | Fat | A class of energy-giving nutrients; also the main form of energy storage in the body |  | 32 |
| 7174677861 | Fatty Acid | hydrocarbon chain often bonded to glycerol in a lipid |  | 33 |
| 7174677862 | Functional Group | An atom or group of atoms that determine the functions or properties of the compound |  | 34 |
| 7174677863 | Genomics | study of whole genomes, including genes and their functions |  | 35 |
| 7174677864 | Geometric Isomer | isomer that differs in the placement of groups around a double bond; cis/trans isomerism |  | 36 |
| 7174677865 | Glycogen | animal starch Extremely branched polymer of glucose. |  | 37 |
| 7174677866 | Glycosidic Linkage | A covalent bond formed between two monosaccharides by a dehydration reaction. |  | 38 |
| 7174677867 | Heat | the transfer of thermal energy |  | 39 |
| 7174677868 | Homeostasis | A tendency to maintain a balanced or constant internal state A tendency to maintain a balanced or constant internal state |  | 40 |
| 7174677869 | Hydrocarbon | Compounds composed of only carbon and hydrogen |  | 41 |
| 7174677870 | Hydrogen Bond | a weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom |  | 42 |
| 7174677871 | Hydrolysis | the chemical breakdown of a compound due to reaction with water. |  | 43 |
| 7174677872 | Hypothesis | A testable prediction, often implied by a theory |  | 44 |
| 7174677873 | Inquiry | an official investigation or formal series of questions |  | 45 |
| 7174677874 | Ion | An atom or group of atoms that has a positive or negative charge. |  | 46 |
| 7174677875 | Ionic Bond | A chemical bond resulting from the attraction between oppositely charged ions. |  | 47 |
| 7174677880 | Isomer | Compounds that have the same chemical formula but different three-dimensional structures |  | 48 |
| 7174677881 | Isotope | Atoms of the same element that have different numbers of neutrons |  | 49 |
| 7174677882 | Joule | SI unit of energy |  | 50 |
| 7174677883 | Kinetic Energy | the energy an object has due to its motion |  | 51 |
| 7174677884 | Law | a summary of many experimental results and observations; a law tells how things work |  | 52 |
| 7174677885 | Lipid | macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes |  | 53 |
| 7174677886 | Matter | Anything that has mass and takes up space |  | 54 |
| 7174677887 | Model Organism | Mice, fruit flies, worms - organisms we use to understand biology because they are easy to maintain and have short generation times |  | 55 |
| 7174677888 | Molarity | the number of moles of solute in one liter of solution |  | 56 |
| 7174677889 | Mole | 6.02x10^23 The SI unit for measuring the amount of a substance |  | 57 |
| 7174677890 | Molecular Mass | The sum of the masses of all the atoms in a molecule; sometimes called molecular weight. |  | 58 |
| 7174677891 | Monomer | a molecule that can be bonded to other identical molecules to form a polymer. |  | 59 |
| 7174677892 | Monosaccharide | A single sugar molecule such as glucose or fructose, the simplest type of sugar. |  | 60 |
| 7174677893 | Natural Selection | A natural process resulting in the evolution of organisms best adapted to the environment. |  | 61 |
| 7174677894 | Negative Feedback | A response to changing conditions that acts to dampen or stop a system's reaction. | | 62 |
| 7174677895 | Neutron | A subatomic particle that has no charge and that is found in the nucleus of an atom |  | 63 |
| 7174677896 | Nonpolar Covalent Bond | a covalent bond in which the electrons are shared equally by the two atoms | | 64 |
| 7174677897 | Nucleic Acid | polymer of nucleotides; the genetic material of organisms. |  | 65 |
| 7174677898 | Nucleotide | monomer of nucleic acids (DNA and RNA) |  | 66 |
| 7174677899 | Orbital | A region of space around the nucleus where an electron is likely to be found. |  | 67 |
| 7174677900 | Organic Chemistry | the study of carbon compounds |  | 68 |
| 7174677901 | Peptide Bond | The covalent bond between two amino acid units, formed by a dehydration reaction. |  | 69 |
| 7174677902 | Phospholipid | a lipid that contains phosphorus and that is a structural component in cell membranes |  | 70 |
| 7174677903 | Polar Covalent Bond | A covalent bond in which electrons are not shared equally |  | 71 |
| 7174677904 | Polymer | A covalent compound made up of many small, repeating units linked together in a chain. |  | 72 |
| 7174677905 | Polypeptide | A polymer (chain) of many amino acids linked together by peptide bonds. |  | 73 |
| 7174677906 | Polysaccharide | A carbohydrate polymer of many monosaccharides linked by dehydration reactions |  | 74 |
| 7174677907 | Positive Feedback | A control mechanism that amplifies rather than reduces the stimulus |  | 75 |
| 7174677908 | Potential Energy | energy that results from the position or shape of an object | | 76 |
| 7174677909 | Prokaryotic Cell | cell lacking a nucleus and most other organelles (bacteria and archeae) |  | 77 |
| 7174677910 | Protein | A three dimensional polymer made of monomers of amino acids. |  | 78 |
| 7174677911 | Purine | double-ring nitrogenous base Adenine and Guanine |  | 79 |
| 7174677912 | Pyrimidine | single-ring nitrogenous base Cytosine and Thymine and Uracil |  | 80 |
| 7174677913 | Reactant | a substance that takes part in and undergoes change during a reaction. |  | 81 |
| 7174677914 | Ribonucleic Acid | RNA Nucleotide monomers that contain the sugar ribose |  | 82 |
| 7174677915 | Ribose | sugar in RNA |  | 83 |
| 7174677916 | Saturated Fatty Acid | Those where all carbons are filled with maximum number of hydrogen atoms |  | 84 |
| 7174677917 | Science | An organized way of gathering and analyzing evidence about the natural world. |  | 85 |
| 7174677918 | Sickle-Cell Anemia | Condition where red blood cells assume an abnormal sickle shape |  | 86 |
| 7174677920 | Single Bond | a covalent bond in which two atoms share one pair of electrons |  | 87 |
| 7174677921 | Solute | the substance that is dissolved |  | 88 |
| 7174677922 | Solution | A homogeneous mixture of two or more substances |  | 89 |
| 7174677923 | Solvent | In a solution, the substance in which the solute dissolves. |  | 90 |
| 7174677924 | Specific Heat | the amount of heat necessary to increase the temperature of a substance |  | 91 |
| 7174677925 | Steroid | large family of chemical substances found in many drugs, hormones, and body components |  | 92 |
| 7174677926 | Structural Isomers | differ in the covalent arrangements of their atoms | | 93 |
| 7174677927 | Surface Tension | A measure of how difficult it is to stretch or break the surface of a liquid that results from the cohesion of water molecules at the surface of a container of water |  | 94 |
| 7174677928 | Temperature | A measure of the average energy of motion of the particles of a substance. |  | 95 |
| 7174677929 | Theory | a well-tested explanation for a broad set of observations |  | 96 |
| 7174677930 | Trace Element | found in very small amounts in the body ex- calcium, iron, iodine |  | 97 |
| 7174677931 | Triacylglycerol | three fatty acids linked to one glycerol molecule. |  | 98 |
| 7174677932 | Triple Bond | A chemical bond formed when atoms share three pairs of electrons |  | 99 |
| 7174677933 | Unsaturated Fatty Acid | a fatty acid that lacks some hydrogen atoms and has one or more points of unsaturation |  | 100 |
| 7174677934 | Valence Electron | Electrons in the outermost energy shell of an atom |  | 101 |
