AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!

apes Flashcards

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6617447418negative feedback loopoutput that results from a system acts as input that moves the system in the other direction0
6617453654homeostasisthe tendency of a system to maintain constant or stable internal conditions1
6617456055watershedthe entire area of land that a river drains2
6617457984emergent propertiescharacteristics not evident in the components alone3
6617462203positive feedback loopdrive a system further toward an extreme4
6617468949agriculturethe practice of raising crops and livestock for human use and consumption5
6617470708croplandland used to raise plants for human use6
6617473621rangelandland used for grazing livestock; pasture7
6617479357endemicspecies that are only found in a specific region8
6617482541zoningthe practice of classifying areas for different types of development and land use9

AP Chemistry Chapter 4 Flashcards

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7267444967aqueous solutiona solution in which the water is the dissolving medium0
7267444968solutionhomogeneous mixture of two or more substances1
7267444969solventsubstance present in the greatest quantity and the one the dissolves the other substances2
7267444970solutethe substances in a solution that are being dissolved (of the least quantity)3
7267444971dissociationthe separation into component ions that occurs when an ionic compound dissolves4
7267444972electrolytea substance whose aqueous solutions contain ions, commonly with ionic compounds5
7267444973nonelectrolytea substance that does not form ions in solution, commonly molecular compounds6
7267444974solvationprocess that helps stabilize the ions in solution and prevents the cations and anions from recombining; this process is symbolized by aq in reactions and causes ions to become dispersely uniform throughout a solution7
7267444975strong electrolytessolutes that exist in solution completely or nearly completely as separate ions; fully or almost fully dissociate; in chemical equations, represented by a full arrow8
7267444976weak electrolytessolutes that exist in solution mostly in the form of molecules with only a small fraction in the form of ions; do not completely dissociate; in a chemical equation, represented by two half arrows9
7267444977chemical equilibriumbalance that produces a state in which the relative numbers of each type of ion or molecule in the reaction are constant over time10
7267444978precipitation reactionreaction that results in the formation of an insoluble product11
7267444979precipitatean insoluble solid formed by a reaction in solution12
7267444980solubilityamount of substance that can be dissolved in a given quantity of solvent at the given temperature (at a given temperature)13
7267444981insolubleA substance is described as ______ if they have a solubility less than 0.01 mol/L14
7267444982metathesis reactionAx + By -> Ay + Bx; these reactions include both single and double replacement reactions15
7267444983molecular equationan equation that shows the complete chemical formulas of the reactants and products without indicating ionic behavior16
7267444984complete ionic equationan equation written with all strong soluble electrolytes shown as ions17
7267444985spectator ionsions that appear in identical forms among both the reactants and products of a complete ionic equation18
7267444986net ionic equationan equation for a reaction in solution showing only those particles that are directly involved in the chemical change19
7267444987acidsubstance that ionizes in aqueous solutions to form hydrogen ions, thereby increasing the concentration of H+(aq) ions; often called proton donors20
7267444988monoprotic acidsacids that yield one H+ per molecule of acid ex) HCl, HNO321
7267444989diprotic acidsacids that yield two H+ per molecule of acid ex) H2SO422
7267444990basesubstance that accepts (reacts with) H+ ions and produce hydroxide ions (OH-) when they dissolve in water; there are common ____s that do not contain hydroxide, however, like NH423
7267444991strong acidsacids that are strong electrolytes (completes ionized in solution)24
7267444992strong basesbases that are strong electrolytes (completely ionized in solution)25
7267444993strong acidsHCl, HBr, HI, HClO3, HClO4, HNO3, H2SO426
7267444994strong basesAll Group 1A metal hydroxides (LiOH, NaOH, KOH, RbOH, CsOH) and heavy Group 2A metal hydroxides (Ca(OH)2, Sr(OH)2, Ba(OH)2)27
7267444995weak acidsacids that are weak electrolytes (partly ionize in solution)28
7267444996weak basesbases that are weak electrolytes (partly ionize in solution)29
7267444997neutralization reactionthe reaction that occurs when a solution of an acid and a solution of a base are mixed30
7267444998saltany ionic compound whose cation comes from a base and whose anion comes from an acid; ____ and water are the products of neutralization reactions31
7267444999oxidation-reduction (redox) reactionreaction in which electrons are transferred between reactants32
7267445000oxidationloss of electrons by a substance33
7267445001reductiongain of electrons by a substance, and therefore increase in negative charge34
7267445002oxidation numbereither the actual charge of a monatomic ion or the hypothetical charge assigned to an atom in a neutral molecule or charged species35
72674450030oxidation number of elemental ions36
7267445004charge of the ionoxidation number for monatomic ions37
7267445005displacement reactionreactions in which the ion in solution is displaced/replaced through oxidation of an element38
7267445006activity serieslist of metals arranged in order of decreasing ease of oxidation; active metals are top and noble metals bottom; any metal on the list can be oxidized by the ions of elements below it39
7267445007concentrationterm used by scientists to designate the amount of solute dissolved in a given quantity of solvent or solution40
7267445008molaritythe concentration of a solution expressed as the number of moles in a liter of solution (mol/L)41
7267445009dilutionprocess in which solutions of lower concentrations can be obtained by adding water42

AP Chemistry VSEPR and Hybridization Flashcards

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5444783153Electron Domain: 4 pairs of electrons surrounding the central atomTetrahedral0
5444783154Electron Domain: Tetrahedral 4 bonds, 0 lone pairTetrahedral (109.5)1
5444783155Electron Domain: Tetrahedral 3 bonds, 1 lone pairTriganol Pyramidal (107)2
5444783156Electron Domain: Tetrahedral 2 bonds, 2 lone pairBent (104.5)3
5444783157Electron Domain: Tetrahedral 1 bond, 3 lone pairLinear (180)4
5444783158Electron Domain: 3 pairs of electrons surrounding the central atomTriganol Planar5
5444783159Electron Domain: Triganol Planar 3 bonds, 0 lone pairTriganol Planar (120)6
5444783160Electron Domain: Triganol Planar 2 bonds, 1 lone pairBent (<120)7
5444783161Electron Domain: Triganol Planar 1 bond, 2 lone pairLinear (<120)8
5444783162Electron Domain: 5 pairs of electrons surrounding the central atomTriganol Bipyramidal9
5444783163Electron Domain: Triganol Bipyramidal 5 bonds, 0 lone pairsTriganol Bipyramidal (90)10
5444783164Electron Domain: Triganol Bipyramidal 4 bonds, 1 lone pairSee-saw (120)11
5444783165Electron Domain: Triganol Bipyramidal 3 bonds, 2 lone pairsT-shape, 12012
5444783166Electron Domain: Triganol Bipyramidal 2 bonds, 3 lone pairsLinear (120)13
5444783167Electron Domain: 6 pairs of electrons surrounding the central atomOctahedral14
5444783168Electron Domain: Octahedral 6 bonds, 0 lone pairsOctahedreal (90)15
5444783169Electron Domain: Octahedral 5 bonds, 1 lone pairSquare pyramidal (180)16
5444783170Electron Domain: Octahedral 4 bonds, 2 lone pairSquare Planar (180)17
5444783171Electron Domain: Octahedral 3 bonds, 3 lone pairT-shape (180)18
5444783172Electron Domain: Octahedral 2 bonds, 4 lone pairLinear (180)19
5444783173Electron Domain: 2 pairs of electrons surrounding the central atom 2 bonds, 0 lone pairLinear20
5444783174Hybridization: LinearSP21
5444783175Hybridization: Triganol PlanarSP^222
5444783176Hybridization: TetrahedralSP^323
5444783177Hybridization: Triganol Bipyramidaldsp^324
5444783178Hybridization: Octahedrald^2sp^325

AP Flashcards

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7726773066plasma membraneflexible outer boundary0
7726773067CytosolGel-like solution made up of water and solube molecules1
7726773068InclusionsInsoluble molecules2
7726773069OrganellesStructures that carry out metabolic activity of cells3
7726773070NucleusDNA containing control center4
7726773071Nuclear envelope and poresDouble membrane barrier that encloses nucleoplasm5
7726773072NucleoliInvolved in rRNA synthesis and ribosome assembly6
7726773073ChromatinConsists of threadlike strands of DNA, RNA, & histone proteins7
7726773074Extra cellular materialSubstances found outside the cells Ex: blood plasma, cerebrospinal fluid8
7726773075lipid bilayerFormed from membrane lipids9
7726773076HydrophilicWater loving, phosphate heads that are polar(charged)10
7726773077HydrophobicWater hating, fatty acid tails that are nonpolar(no charge)11
7726773078Membrane proteinsAllow cell communication with environment12
7726773079integral proteinsLocation: firmly inserted into membrane Function: transport proteins13
7726773080Peripheral proteinsLocation: loosely attached to integral proteins Function: motor proteins for shape change during cell division and muscle contraction14

AP Flashcards

Terms : Hide Images
7728295289Nucleic acid synthesis ribsomal subunitnucleaus0
7728296145protein and lipid synthesisER1
7728296619packiging of proteinsGolgi Apparatus2
7728297616Acid compartmentvacuole3
7728298801degradation of toxinsperoxisomes4
7728301609intracellular degradationlysosomes5
7728303537ribosome synthesisnucleolus6
7728307993secretory and membrane proteins producesRER7
7728308525glycosylation beginsRER8
7728309592sythesis of lipids and steriodsSER9
7728311421PROTEINS PRODUCEDribosomes10
7728315161functions at the site of respirationmitochondria11
7728317190network of protein filamentscytoskeleton12
7728318809contains circular DNAmitochondria13
7728322748way of DNA5-314
7728323948bead on a string histone proteinsnucleosome15
7728326379DNA--->RNAtranscription16
7728326923RNA____> ProteinTRanslation17
7728327989location of transcriptionnucleus18
7728328532location of translationCytoplasm19
77283340253 steps of TCinitiation elogation termination20
7728337129removed by splicesomesintrons21
7728338589attatched to a contiguos codeextrons22
7728342456Start codon for MrNAAUG methione23
7728348609DNA synthesis happens in which phaseS phase24
7728349070cell explansion happens in which phasedG125
7728350395protein synthesis happens in which phaseG226
7728356026unzips the DNAhelicase27
7728356027makes new DNADNA polyermase28
7728357402removes RNA primer and fills in the space left with DNADNA polymerase 129
7728357964adds RNA primer to the template DNAprimase30
7728359466attaches the seperate strands of new DNA togetherLIgase31

AP Flashcards

Terms : Hide Images
8587800282Raphael SantiKilala dahil sa kanyang mga pintang "Madonnas"0
8587800283Galileo Galileinakatuklas ng teleskopyo1
8587800284Francesco PetrarchAma ng Humanismo2
8587800285Giovanni BoccaccioKilala dahil sa akda niyang "Decameron3
8587800286Desiderious ErasmusPrinsipe ng Humanista4
8587800287DonatelloEstatwa ni Saint George5
8587800288ParacelsusNadiskubre ang kahalagahan ng mineral bilang gamot6
8587800289Rudolf AgricolaNagpalaganap ng Humanismo sa lanas ng Italya7
8587800290Dante AlighieriThe Divine Comedy8
8587800291William HarveyNadiskubre ang sirkulasyon ng dugo9
8587800292Niccolo PisanoCathedral of Pisa sa Sienna10
8587800293Donato BramanteOrihinal na iskultor ng St. Peter Basilica11
8587800294Andreas Vesalius"Seven Structures of the Human Body"12
8587800295Thomas MoreEuthopia13
8587800296Gerardus Mercatorgumawa ng isang larawan ng mundo sa isang patag na lugar14
8587800297Johannes KeplerNakatuklas ng alituntuning pangmatematika tungkol sa mga planeta15
8587800298Flippo BrunelleschiDome ng Cathedral of Florence16
8587800299Leon Battista AlbertiSanta Maria Novella17
8587800300Johannes GutenbergInventor ng Printing Press18
8587800301Baldassare CastiglioneThe Book of the Courtier19
8587800302Lorenzo Ghibertigumawa ng Gintong pinto na tinawag ni Michelangelo na "Gates of Paradise"20

AP French Essay Terms Flashcards

useful terms for the ap french essay (sorry no accents).

Terms : Hide Images
5930460124à cause debecause of0
5930460125à l'avenirin the future1
5930460126à l'époquein those days2
5930460127à la suite defollowing3
5930460128aussi faut-ilit is therefore important to4
5930460129aussi faut-il queit is therefore important that5
5930460130au sujet deabout6
5930460131autrefoisformerly, in the past, in the olden days7
5930460132autrement ditin other words8
5930460133c'est justement parce queit is exactly because9
5930460134ce qui est frappant, c'estwhat is striking is10
5930460135ce qui est inquiétantwhat is unsettling11
5930460136ce qui est intéressantwhat is interesting12
5930460137ce qui est surprenantwhat is surprising13
5930460138ce qui est plutôtwhat is rather14
5930460139cependanthowever15
5930460140d'abordfirst16
5930460141d'ailleursbesides17
5930460142d'aprèsaccording to18
5930460143dans un avenir prochein the near future19
5930460144de nos joursnowadays20
5930460145de plusfurthermore21
5930460146de plus en plusmore and more22
5930460147de toute façonen tout cas, in any case23
5930460148le dénouementthe outcome24
5930460149désormaisdorénavant, from now on25
5930460150dés lorsfrom then on26
5930460151dorénavantdésormais, from now on27
5930460152en dépit demalgré, in spite of28
5930460153en outremoreover29
5930460154en revancheon the other hand30
5930460155en tout casde toute façon, in any case31
5930460156enfinfinally, at last32
5930460157ensuitethen33
5930460158entendre dire queto hear that34
5930460159enverstowards (abstrait)35
5930460160évidemmentobviously36
5930460161il me semble queit seems to me that (i)37
5930460162il ne faut pas oublier queone must not forget that38
5930460163il paraît queit is rumored that (i)39
5930460164il s'agit deit is about40
5930460165il semble queit seems that (s)41
5930460166il va sans dire queit goes without saying that42
5930460167malgréen dépit de, in spite of43
5930460168n'oublions pas quelet us not forget that44
5930460169néanmoinsnevertheless45
5930460170outreapart from46
5930460171par contreon the other hand47
5930460172par rapport àin relation to48
5930460173un personnagecharacter49
5930460174peut-êtremaybe50
5930460175plus...plusthe more...the more (NO "le")51
5930460176pourtanttoutefois, however52
5930460177le rapportthe relationship53
5930460178selonaccording to54
5930460179tout cela peutall this can55
5930460180toutefoispourtant, however56
5930481347grâce àthanks to57
5930483457bien quealthough (s)58
5930494393actuellementat the present time/presently59
5930496446en faitactually60
5930498270de moins en moinsless and less61
5930502104dans les années 80in the 80's62
5930503980en plusfurthermore/in addition63
5930507349saufexcept64
5930507962pourafin de, (in order) to65
5930510347afin depour, (in order) to66

AP Government Ch. 10 Flashcards

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4901030784Interest GroupAn organization of people with shared policy goals entering the policy process at several points to try to achieve those goals.0
4901030785PluralismA theory of government and politics emphasizing that many groups, each pressing for its preferred policies, compete and counterbalance one another in the political marketplace.1
4901030786ElitismA theory of government and politics contending that an upper-class elite will hold most of the power and thus in effect run the government.2
4901030787HyperpluralismA theory of government and politics contending that groups are so strong that government, seeking to please them all, is thereby weakened.3
4901030788Iron TrianglesSub governments are composed of interest group leaders interested in a particular policy, the government agency in charge of administering that policy, and the members of congressional committees and subcommittees handling that policy; they exercise a great deal of control over specific policy areas.4
4901030789Potential GroupAll the people who might be interested group members because they share common interests.5
4901030790Actual groupThe people in the potential group who actually join.6
4901030791Collective GoodSomething of value that cannot be withheld from a potential group member.7
4901030792Free-Rider ProblemFor a group, the problem of people not joining because they can benefit from the group's activities without joining.8
4901030793Selective BenefitsGoods that a group can restrict to those who actually join.9
4901030794Single-Issue GroupsGroups that have a narrow interest, tend to dislike compromise, and often draw membership from people new to politics.10
4901030795LobbyingA "communication, by someone other than a citizen acting on his or her behalf, directed to a governmental decision maker with the hope of influencing his or her decision."11
4901030796ElectioneeringDirect group involvements in the electoral process, for example, by helping fund campaigns, getting members to work for candidates, and forming political action committees.12
4901030797Political Action ComitteesGroups that raise money from individuals and then distribute it in the form of contributions to candidates that the group supports.13
4901030798Union ShopA provision found in some collective bargaining agreements requiring all employees of a business to join the union within a short period, usually 30 days, and to remain members as a condition of employment.14
4901030799Right-To-Work LawsA state law forbidding requirements that worker must join a union to hold their jobs. Specifically permitted by the Taft-Haley Act of 1947.15
4901030800Public Interest LobbiesOrganizations that seek "a collective good, the achievement of which will not selectively and materially benefit the membership or activists of the organization."16

AP Biology Chapter 3 Flashcards

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7767977533isomerscompounds- same molecular formula, different structural formulas0
7767977534structural isomersdiffer in arrangement of atoms and often in location of double bonds1
7767977535geometric isomerssame covalent bonds, differ in arrangement around double bond2
7767977536enantiomersleft and right handed (mirror images) of each other3
7767977537macromoleculelarge molecule made by joining smaller molecules together4
7767977538polymerchainlike molecule formed by linking together man similar small molecule (monomers)5
7767977539dehydration synthesisreaction joining monomers to form polymers or other macromolecules6
7767977540hydrolysisbreaking of bonds between monomers through the addition of water7
7767977541Carbohydrates-sugars and their polymers -sugars serve as fuel and carbon sources -have general formula of (CH2O)n monosaccharides8
7767977542glucoseCARBOHYDRATES -C6H12O6 -broken down to yield energy in cellular respiration9
7767977543disaccharideCARBOHYDRATES -two monosaccharides bonded together by a glycosidic linkage (a covalent bond formed a dehydration reaction between two monosaccharides10
7767977544glucose+fructose=CARBOHYDRATES sucrose (table sugar)11
7767977545glucose+glucose=CARBOHYDRATES maltose12
7767977546polysaccharidesCARBOHYDRATES -polymers of sugars -have storage and structural roles13
7767977547starchCARBOHYDRATES -energy storage molecule -polymer made of glucose molecules joined b 1-4 linkages (helical shape) -polymer of a-glucose14
7767977548glycogen-storage molecule in animals -highly branched polymer of glucose -polymer of a-glucose15
7767977549celluloseCARBOHYDRATES -major structural component of plant cells (most abundant organic compound on earth) β linkages of cellulose cannot be broken down by the enzymes that digest starch-> very few organisms (some bacteria, microorganisms and fungi) are able to digest cellulose16
7767977550chitinCARBOHYDRATES -polysaccharides that from glucose monomers with nitrogen-containing group -found in exoskeleton of arthropods and cell walls of many fungi -polymer of b-glucose17
7767977551lipids-fats, phospholipids, steroids -do not form polymers18
7767977552fats (Triglycerides)LIPIDS composed of 3 fatty acids attached to a glycerol19
7767977553fatty acidLIPIDS long hydrocarbon chain with a carboxyl group at end20
7767977554glycerolLIPIDS 3-carbon alcohol21
7767977555ester linkagesLIPIDS bond between hydroxyl and carboxyl group (links fatty acid to glycerol22
7767977556unsaturated fatty acidsLIPIDS -has c=c bond -kinked/liquid -fats of plants and fishes -more unsaturated, the better -2+ covalent bonds23
7767977557saturated fatty acidsLIPIDS - no c=c bonds -solid -animal fats -cardio diseases -single covalent bond24
7767977558phospholipidsLIPIDS -glycerol linked to two acids and a negatively charged phosphate group -phosphate is hydrophilic, water soluble -fatty acid is hydrophobic - in cell membrane, head face out, tail face in25
7767977559Proteins-consists of one or more polypeptide chains folded into 3-D, shapes determines functions26
7767977560polypeptidePROTEINS polymer of amino acids27
7767977561R groupPROTEINS -variable side chain that gives each amino acid its unique physical and chemical properties -hydrophobic interactions, van der Waals interactions, hydrogen bonds and ionic bonds28
7767977562peptide bondPROTEINS links amino group of one amino acid with the carboxyl group of another formed b dehydration synthesis rxn29
7767977563Four Levels of Protein StructurePROTEINS -biologists use x-ray crystallography and computer modeling to establish the 3D shapes of protein Primary Structure: sequence of amino acids Secondary structure: coiling or folding of amino acid chain (polypeptide), stabilized by hydrogen bonds between oxygen of one amino acid and hydrogen of another, can be coiled (a helix) or pleated (B pleated helix) Tertiary structure: interactions between R groups produce unique shape for each protein, maintained b disulfide bonds Quaternary structure: proteins are composed of two or more polypeptide chains in precise arrangement.30
7767977564denaturationPROTEINS -interactions that give proteins their shape can be disrupted by changes in pH, slat concentration, or temperature -causes proteins to lose their shape and function31
7767977565disulfide bridgesPROTEINS covalent bonds between sulfhydryl side groups of cysteine monomers32
7767977566nucleic acidsmacromolecules that carry and transmit the genetic code33
7767977567DNANUCLEIC ACIDS -deoxyribonucleic acid: the genetic material that is inherited from one generation to the next, deoxyribose sugar34
7767977568RNANUCLEIC ACIDS -ribonucleic acid, transcribes genetic information from the DA and directs the synthesis of proteins, ribose sugar35
7767977569nucleotideNUCLEIC ACIDS -building blocks of nucleic acids- consists of a 5-carbon sugar, phosphate group and a nitrogen base -pyrimidine: nitrogenous bases consisting of single ring, cytosine (C) both DNA RNA, thymine (T) DNA and uracil (U) RNA -purine: nitrogenous base consisting of two rings, adenine (A) and guanine (G)36
7767977570monomers or componentssugars: monosaccharides lipids: fatty acids proteins: amino acids nucleic acids: nucleotides37
7767977571polymer or large moleculesugars: polysaccharides lipids: triacylglycerols proteins: polypeptides nucleic acids: polynucleotides38
7767977572type of linkagesugar: glycosidic linkages lipids: ester linkages proteins: peptide bonds nucleic acids: phosphodiester linkages39
7767977573Which type of molecule includes an example with a long-chain carbon backbone?lipid40
7767977574What is the dominant element attached to the carbon backbone?hydrogen41
7767977575Which molecule have a central carbon atom with 4 different components around it?amino acids42
7767977576Which molecule have a sugar, nitrogenous base and phosphate group?nucleic acid43
7767977577What three structural groups shown do all amino acids have in common?amine, carboxyl and R group with hydrogen44
7767977578Functions of 4 biological macromoleculescarbohydrates: energy storage, receptors, structure of plant cell wall, cellulose, glucose, deoxyribose, methionine proteins: enzymes, structure, receptors, transport lipids: membrane structure, energy storage, insulation, enzymes, chemical signaling(hormones) nucleic acids: information storage and transfer45
7767977579Chemical properties of hydrocarbons-composed of only carbon and hydrogen, -contains a large amount of stored energy, -may have linear, branched or ring structures, insoluble in water46
7767977580the number of covalent bonds formed by an atom of carbon is determined bythe number of electrons in its outermost electron shell47
7767977581Proteins are able to perform man diverse biological functions becausethe are polymers formed from chemically diverse subunits which can fold into many different shapes48
7767977582The sugar subunits in the DNA backbone are joined by what type of bonds?phosphodiester bonds49
7767977583salt and vinegar preserve our food byhigh heat, low pH, and high salt concentrations50
7767977584DNA is a good for storage of energy because...Ladder structure holds same info, so if some get damaged, it can be recovered51
7767977585Advantage of fat-dense, doesn't take up a lot of room -reserved for future use -doesn't weight as much52
7767977586Carboxylic acid group53
7767977587amine group54
7767977588phosphate group55
7767977589sugar group56
7767977590nitrogen base57
7767977591starch in a chloroplast58
7767977592starch59
7767977593monosaccharide60
7767977594nucleotide61
7767977595intermediate filament62
7767977596polypeptide63
7767977597amino acid64
7767977598adipose cell with fat droplets65
7767977599triglyceride66
7767977600fatty acid67
7767977601dehydration reaction68
7767977602hydrolysis reaction69
7767977603glucose70
7767977604sucrose71
7767977605maltose72
7767977606phosphodiester bonds73
7767977607dipeptide74
7767977608how do one make a polypeptide?with two amino acid group75
7767977609glucose+fructose=lactose (sugar in milk)76
7767977610fatty acid-hydrocarbons with carbonyl group at the end of the chain77
7767977611monounsaturated fatty acid fat-one double covalent bond78
7767977612phospholipids79
7767977613steroidsbackbone of four linked carbon rings80
7767977614steroids81
7767977615nitrogen basesadenine-thymine cytosine-guanine82

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