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Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Acid   Chemical compound that ionizes to form hydrogen ions (H+) in aqueous solution  
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Alkali   A substance that, when dissolved in water, Island izes into negatively charged hydroxide (OH) ions and positively charged ions of a metal  
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Amino acids   Small molecular units that make up protein molecules  
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Atom   Smallest piece of an element  
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Base   Chemical compound yielding hydroxyl ions (OH) in an aqueous solution, which will react with acid to form a salt and water  
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Buffer   A compound that maintains the chemical balance in a living organism  
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Carbohydrate   An organic compound of carbon, hydrogen, and oxygen as sugar or starch  
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Chemical bond   Bond formed when atoms share or combine their electrons with atoms of other elements  
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Chemistry   Study of the structure of matter and the composition of substances, their properties, and their chemical reactions  
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Cholesterol   A steroid normally synthesized in the liver and also ingested in egg yolks, animal fats, and tissues  
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Compounds   Elements combined in definite proportion by weight to form a new substance  
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Covalent bond   Type of bond in which the atoms share electrons to fill the outermost shell of levels  
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Dehydrated   An abnormal inflation of body fluids  
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Dehydration synthesis   Occurs when water is removed from a molecule; the molecule fuses together and a new substance is formed during the anabolic process  
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Deoxyribonucleic acid (DNA)   A nucleic acid containing the elements of carbon, hydrogen, oxygen, nitrogen, and phosphorus; genetic material  
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Disaccharide   Double sugar  
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Electrolytes   Electrically charged particles that help determine fluid and acid-base balance  
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Electron   A subatomic particle of an atom that is arranged around the nucleus in orbital zones or electron shells. An electron has a negative (-) charge.  
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Element   Made up of like atoms; substance that can neither be created nor destroyed  
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Energy   Ability to do work  
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Enzymes   Organic Catalyst that initiate and accelerate a chemical reaction  
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Extracellular fluid   Fluid outside of a cell  
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Fat   Compound made up of glycerol and fatty acids  
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Glycogen   Polysaccharide formed and stored largely in the liver  
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Hydrogen bond   Heels together by forming a bridge between the negative oxygen atom of one water molecule and positive hydrogen atom of another molecule  
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Hydrolysis   Occurs when water is added to the molecule to break down larger molecules in a catabolic reaction  
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Hydroxide   One atom of hydrogen and one atom of oxygen  
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Interstitial fluid   Another name for lymph fluid; fluid between the tissue  
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Intracellular fluid   Fluid within the cell  
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Ion   An electrically charged atom  
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Ionic bond   Bond in which one atom gives up an electron to another atom  
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Isotopes   Atoms of a specific element that have the same number of protons but a different number of neutrons  
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Kinetic energy   Work resulting in motion  
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Lipid   Fatty compound  
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Matter   Anything that has weight and occupies space  
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Molecule   The smallest unit of a compound that still has the properties of the compound  
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Monosaccharide   Simple sugar; glucose  
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Multicellular   Many celled  
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Neutralization   Process in which an acid and a base combine to form a salt and water  
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Neutron   A subatomic particle of an atom that, with a proton, makes up the nucleus of the atom; a neutron has no electric charge  
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Nucleic acid   Organic compound containing carbon, hydrogen, oxygen, nitrogen, and phosphorus (i.e., DNA, RNA)  
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Organic catalyst   A substance that affects the rate of speed of a chemical reaction without itself being changed  
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Organic compound   Compound that contains the element carbon  
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pH scale   A measure of acidity or alkalinity of a solution  
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Phospholipids   Fats that contain carbon, hydrogen, oxygen, and phosphorus  
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Polysaccharide   A complex sugar  
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Potential energy   Energy stored in cells waiting to be released  
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Protein   Containing the elements of carbon; hydrogen; oxygen; nitrogen and most times, phosphorus and sulfur. Protein is necessary to build and repair body tissue.  
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Protein synthesis   Production of protein by the cells that are essential to life  
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Proton   A subatomic particle of an atom; with neutrons, it makes up the nucleus of the atom. The proton has a positive (+) charge  
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Radioactive   Capable of emitting energy in the form of radiation  
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Ribonucleic acid (RNA)   Type of nucleic acid  
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Steroids   Lipids or fats that contain cholesterol  
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Triglycerides   Also called fats consist of glycerol and fatty acids, make up 95% of fats in the human body  
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Unicellular    
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