| 5187810665 | matter | anything that takes up space and has mass | | 0 |
| 5187810666 | element | substance that cannot be broken down to other substances by chemical reactions | | 1 |
| 5187810667 | compound | substance consisting of two or more elements combined in a fixed ratio | | 2 |
| 5187810668 | Which four elements make up 96% of living matter? | carbon, hydrogen, oxygen, nitrogen | | 3 |
| 5187810669 | How many of the 92 elements are known to be essential to life? | 25 | | 4 |
| 5187810670 | trace elements | those required by organisms in only minute quantities | | 5 |
| 5187810671 | atoms | smallest unit of an element that still retains the property of the element; composed of neutrons, protons, electrons | | 6 |
| 5187810672 | protons | positively charged particles, found in the nucleus and determine the element | | 7 |
| 5187810673 | electrons | negatively charged particles found in electron shells around the nucleus, determine the chemical properties and reactivity of the element | | 8 |
| 5187810674 | neutrons | particles with no charge, found in the nucleus; their number can vary in the same element, causing isotopes | | 9 |
| 5187810675 | isotopes | forms of an element with different numbers of neutrons | | 10 |
| 5187810676 | atomic number | number of protons an element possesses, unique to every element | | 11 |
| 5187810677 | mass number | sum of an element's protons and neutrons | | 12 |
| 5187810678 | How to read an element of the periodic table. | |  | 13 |
| 5187810679 | chemical bonds | defined as interactions between the valence electrons of different atoms, hold together atoms to form molecules | | 14 |
| 5187810680 | covalent bond | occur when valence electrons are shared by two atoms | | 15 |
| 5187810681 | nonpolar covalent bonds | occur when the electrons being shared are shared equally between two atoms | | 16 |
| 5187810682 | electronegativity | a tendency to attract electrons of a covalent bond; oxygen is extremely electronegative | | 17 |
| 5187810683 | polar covalent bond | one atom has a greater electronegativity than the other, resulting in the unequal sharing of electrons |  | 18 |
| 5187810684 | ionic bonds | bonds in which two atoms attract valence electrons so unequally that the more electronegative atom steals the electron away from the less electronegative atom; occur because these ions will be either +/- charged | | 19 |
| 5187810685 | ion | resulting charged atom or molecule | | 20 |
| 5187810686 | hydrogen bonds | relatively weak bonds that form between the partial positively charged hydrogen atom of one molecule and the strongly electronegative oxygen or nitrogen of another molecule | | 21 |
| 5187810687 | Van der Waals interactions | very weak, transient connections that are the result of asymmetrical distribution of electrons within a molecule, contribute to the 3D shape of molecules | | 22 |
| 5187810688 | chemical reaction | shows the reactants and products | | 23 |
| 5187810689 | reactants | starting materials | | 24 |
| 5187810690 | products | ending materials | | 25 |
| 5187810691 | What does the coefficient in front of each molecule in a chemical reaction signify? | number of molecules involved | | 26 |
| 5187810692 | The number of atoms of each element is the ____ on each side of the reaction. | same | | 27 |
| 5187810693 | chemical equilibirum | the point at which the forward and reverse reactions offset one another exactly, their concentrations have stabilized at a particular ratio, but they are not necessarily equal | | 28 |
| 5187810694 | Describe the structure of water. | Water is composed of one atom of oxygen and two atoms of hydrogen, bonded to form a molecule. | | 29 |
| 5187810695 | Describe the polarity of a water molecule. | The oxygen region of the molecule has a partial negative charge, and each hydrogen has a partial positive charge. | | 30 |
| 5187810696 | What type of bond holds water molecules together? | hydrogen bonds | | 31 |
| 5187810697 | How many hydrogen bonds can each water molecule form at a time? | four | | 32 |
| 5187810698 | Name the four water properties. | 1. cohesion
2. high specific heat
3. ice floats
4. universal solvent | | 33 |
| 5187810699 | cohesion | the linking of water molecules | | 34 |
| 5187810700 | surface tension | allows a water strider to walk on top of a pond due as a result of cohesion | | 35 |
| 5187810701 | adhesion | clinging of one substance to another
ex: water droplets to a windshield | | 36 |
| 5187810702 | transpiration | movement of water molecules up the very thin xylem tubes and their evaporation from the stomata in plants | | 37 |
| 5187810703 | How do water molecules cling to each other? | cohesion | | 38 |
| 5187810704 | How do water molecules cling to the walls of xylem tubes (capillary action)? | adhesion | | 39 |
| 5187810705 | specific heat | the amount of heat required to raise or lower the temperature of a substance by 1 degree C | | 40 |
| 5187810706 | What is a practical application of water's high specific heat? | makes the temperature of Earth's oceans relatively stable and able to support vast quantities of both plant and animal life | | 41 |
| 5187810707 | Why does ice float? | water is less dense as a solid than in its liquid state, allowing ice to float; this keeps large bodies of water from freezing solid and moderating temperature | | 42 |
| 5187810708 | solvent | substance that something is dissolved in | | 43 |
| 5187810709 | solute | substance being dissolved | | 44 |
| 5187810710 | solution | the combination of solvent and solute | | 45 |
| 5187810711 | hydrophillic substances | water-soluble, these include ionic compounds, polar molecules, and some proteins | | 46 |
| 5187810712 | hydrophobic substances | nonpolar and do not dissolve in water, oils | | 47 |
| 5187810713 | pH scale | runs between 0 and 14 and measures the relative acidity and alkalinity of aqueous solutions |  | 48 |
| 5187810714 | acids | have an excess of H+ ions and pH below 7 | | 49 |
| 5187810715 | bases | have an excess of OH- ions and pH above 7 | | 50 |
| 5187810716 | What is the pH of pure water? | neutral, pH of 7 | | 51 |
| 5187810717 | buffers | substances that minimize changes in pH, they accept H+ from the solution when they are in excess and donate H+ when they are depleted | | 52 |
| 5187810718 | carbonic acid (H2CO3) | an important buffer in living systems, moderates pH changes in blood plasma and the ocean | | 53 |
| 5187810719 | What are the major elements of life? | PSCOHN, phosphorus, sulfate, carbon, oxygen, hydrogen, nitrogen | | 54 |
| 5187810720 | organic compounds | contain carbon and hydrogen | | 55 |
| 5187810721 | Is the artificial synthesis of organic compounds possible? | yes | | 56 |
| 5187810722 | Stanley Miller experiment 1953 | showed that the complex organic molecules could arise spontaneously | | 57 |
| 5187810723 | Why is carbon so unique? | it has four valence electrons, it can form up to four covalent bonds, single/double/triple covalent bonds, can form large molecules, chains/ring-shaped/branched molecules | | 58 |
| 5187810724 | isomers | molecules that have the same molecular formula but differ in their arrangement of these atoms, can result in molecules that are very different in biological activities
ex: glucose and fructose | | 59 |
| 5187810725 | functional groups | attached to the carbon skeleton and have diverse properties; the behavior of these organic molecules is dependent on the identity of functional groups | | 60 |
| 5187810726 | hydroxyl | OH
ex: alcohols such as ethanol, methanol
function: helps dissolve molecules like sugars | | 61 |
| 5187810727 | carboxyl | COOH
ex: carboxylic acids like fatty acids and sugars
function: acidic properties because tend to ionize, source of H+ ions | | 62 |
| 5187810728 | carbonyl | CO
ex: ketones and aldehydes like sugars | | 63 |
| 5187810729 | amino | NH2
ex: amines such as amino acids | | 64 |
| 5187810730 | phosphate | PO3
ex: organic phosphates like ATP, DNA, and phospholipids | | 65 |
| 5187810731 | sulfhydryl | SH
found in some amino acids, forms disulfide bridges in proteins | | 66 |
| 5187810732 | methyl | CH3
the addition of this group affects the expression of genes | | 67 |
| 5187810733 | polymers | long chain molecules made of repeating subunits called monomers
ex: starch is a polymer composed of glucose monomers |  | 68 |
| 5187810734 | dehydration reactions | create polymers from monomers in which two monomers are joined by removing one molecule of water |  | 69 |
| 5187810735 | hydrolysis | occurs when water is added to split large molecules, occurs in reverse of dehydration reactions |  | 70 |
| 5187810736 | carbohydrates | include both simple sugars and polymers; all exists in a ratio of 1C:2H:1O | | 71 |
| 5187810737 | monosaccharides | monomers of carbohydrates
ex: glucose and ribose | | 72 |
| 5187810738 | polysaccharides | polymers of monosaccharides
ex: starch, cellulose, glycogen | | 73 |
| 5187810739 | What are the two functions of polysaccharides? | energy storage and structural support | | 74 |
| 5187810740 | Provide two examples of energy storage polysaccharides. | starch, glycogen | | 75 |
| 5187810741 | starch | storage polysaccharide found in plants
ex: potatoes | | 76 |
| 5187810742 | glycogen | storage polysaccharide found in animals, vertebrate muscle cells, liver cells | | 77 |
| 5187810743 | Provide two examples of structural support polysaccharides. | cellulose, chitin | | 78 |
| 5187810744 | cellulose | major component of plant cell walls | | 79 |
| 5187810745 | chitin | found in the exoskeleton of arthropods, like lobsters and insects and the cell walls of fungi | | 80 |
| 5187810746 | lipids | all hydrophobic, are not polymers and are assembled from a variety of components
ex: waxes, oils, fats, steroids | | 81 |
| 5187810747 | fats | also called triglycerides, made up of a glycerol molecule and three fatty acid molecules | | 82 |
| 5187810748 | fatty acids | include hydrocarbon chains of variable lengths, chains are nonpolar and hydrophobic | | 83 |
| 5187810749 | saturated fatty acids | have no double bonds between carbons, tend to pack solidly at room temperature, are linked to cardiovascular disease, commonly produced by animals
ex: butter, lard | | 84 |
| 5187810750 | unsaturated fatty acids | have some carbon double bonds resulting in kinks, tend to be liquid at room temperature, commonly produced by plants
ex: corn oil, olive oil | | 85 |
| 5187810751 | What are the functions of lipids? | energy storage and protection of vital organs and insulation | | 86 |
| 5187810752 | Describe the energy storage of lipids. | fats store twice as many calories per gram as carbohydrates | | 87 |
| 5187810753 | Where is fat stored? | adipose cells | | 88 |
| 5187810754 | phospholipids | make up cell membranes, have a glycerol backbone (hydrophilic head), have two fatty acid tails (hydrophobic), arranged in a bilayer forming the cell membrane |  | 89 |
| 5187810755 | steroids | made up of four rings that are fused together | | 90 |
| 5187810756 | cholesterol | steroid, component common of cell membranes | | 91 |
| 5187810757 | What are examples of steroid hormones? | estrogen and testosterone | | 92 |
| 5187810758 | proteins | polymers made up of amino acid monomers | | 93 |
| 5187810759 | amino acids | contain a central carbon bonded to a carboxyl group, an amino group, a hydrogen atom, and an R group (variable group or side chain) |  | 94 |
| 5187810760 | peptide bonds | link amino acids, formed by dehydration synthesis | | 95 |
| 5187810761 | What are the four levels of protein structure? | primary, secondary, tertiary, quaternary |  | 96 |
| 5187810762 | primary structure | the unique sequence in which amino acids are joined | | 97 |
| 5187810763 | secondary structure | refers to one of two three-dimensional shapes that are the result of hydrogen bonding: alpha helix and beta pleated sheet | | 98 |
| 5187810764 | alpha helix | coiled shape, much like a slinky |  | 99 |
| 5187810765 | beta pleated sheet | accordion shape |  | 100 |
| 5187810766 | tertiary structure | results in a complex globular shape, due to interactions between R groups, such as hydrophobic interactions, Van der Waals interactions, hydrogen bonds, disulfide bridges | | 101 |
| 5187810767 | How are globular proteins held in position? | R group interactions | | 102 |
| 5187810768 | quaternary structure | refers to the association of two or more polypeptide chains into one large protein
ex: hemoglobin | | 103 |
| 5187810769 | Protein shape is crucial to... | protein function. When a protein does not fold properly, its function is changed. | | 104 |
| 5187810770 | chaperonins | protein molecules that assist in the proper folding of proteins within cells, provide an isolating environment in which a polypeptide chain may attain final confirmation | | 105 |
| 5187810771 | denatured | result of a protein that has lost its shape and ability to function due to change in heat, pH, or some other disturbance | | 106 |
| 5187810772 | What are the two nucleic acids? | DNA and RNA | | 107 |
| 5187810773 | What are the monomers of nucleic acids? | nucleotidea | | 108 |
| 5187810774 | What are the three components of nucleotides? | nitrogenous bases (A, T, C, G, U)
pentose (5C sugar, either ribose/deoxyribose)
phosphate group |  | 109 |
| 5187810775 | Describe DNA. | molecule of heredity, double-stranded helix, A bonds to T, C bonds to G | | 110 |
| 5187810776 | Describe RNA. | single stranded, does not contain Thymine (Uracil instead) | | 111 |