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AP Biology Unit 3 Chapter 8 - Energetics Flashcards

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8185508667Metabolismthe totality of an organisms chemical reactions that result from interactions between molecules within the cell0
8185508668metabolic pathwaya sequence of chemical reactions undergone by a compound in a living organism, start with substrate end with product1
8185508669catabolicbreaking a complex molecule down into its simpler parts, releasing energy. ie. cellular respiration2
8185508670anabolicusing energy to build complex molecules from simpler molecules. ie. protein synthesis3
8185508672energycapacity to cause change, do work4
8185508673kinetic energyenergy of motion5
8185508674heat(thermal energy)kinetic energy associated with random movement of molecules6
8185508675potential energyenergy of position7
8185508676chemical energypotential energy available for release in a chemical reaction, energy within bonds8
8185508677thermodynamicsstudy of energy transformations9
81855086801st law of thermodynamicsenergy of the universe is constant, cannot be created or destroyed, can only be transferred or transformed, conservation of energy10
81855086812nd law of thermodynamicsduring every energy transfer, some energy is unusable and often lost, every energy transfer or transformation increases the total entropy of the universe11
8185508682entropydisorder, randomness12
8185508683free energydelta G, energy that can do work when temperature and pressure are constant, related to change in enthalpy(delta H), change in entropy(delta S) and temperature in Kelvin(T). delta G = delta H - T delta S13
8185508684exergonic reactiona reaction with a net release of free energy, negative free energy, spontaneous14
8185508685endergonic reactiona reaction that absorbs free energy from its surroundings, non-spontaneous, positive free energy15
8185508686coupled reactionsthe use of exergonic processes to drive endergonic ones, the energy given off from the exergonic is absorbed by the endergonic16
8185508687ATPadenosine triphosphate, composed of ribose (5 carbon sugar), adenine (nitrogenous base), and 3 phosphate groups. Phosphate tail can be broken through hydrolysis to produce energy, ADP, and an inorganic phosphate17
8185508688phosphorylationhow ATP drives endergonic reactions, covalently bonding a phosphate with another molecule, such as as reactant18
8185508689catalysta chemical agent that speeds up chemical reactions without being consumed by the reaction19
8185508690enzymesa catalytic protein, speeds up metabolic reactions by lowering activation energy, very specific, reusable, unchanged by reaction20
8185508691activation energyinitial energy needed to start a chemical reaction, free energy for activating reaction, given off by heat21
8185508692induced fitbrings the chemical groups of the active site into positions that enhance their ability to catalyze the reaction, makes the enzyme more effective22
8185508693cooperativityanother type of allosteric activation, binds to one active site but locks ALL active sites open, allowing products to be constantly produced23
8185508694Substratethe REACTANT that an enzyme acts on24
8185508695Enzyme-Substrate Complexenzyme and substrate25
8185508696Active Siteregion on the enzyme where substrate binds26
8185508698Lock and Keyactive site on enzyme fits substrate exactly27
81855087003 kinds of cellular work done by ATPShuttle renewable and nonrenewable ENERGY, provide ENERGY for cellular functions, provide ENERGY for catabolic reactions28
8185508701Ways enzymes lower activation energycan do this by having a favorable environment, straining substrate molecules, orienting substrates correctly29
8185508703cofactorsnon-protein enzyme helpers ex. zinc, iron, copper30
8185508704coenzymesorganic enzyme helpers ex. vitamens31
8185508705Denatureabove a certain temp activity declines, protein unwinds32
8185508708Feedback inhibitionend product of a pathway that continues to produce product (positive) and then turns off (negative)33
8185508709negative feedback inhibitionaccumulation of end product slows the process that produces that amount -stop production34
8185508710positive feedback inhibitionend product speeds up production (less common)35
8185508711Allosteric Regulationcan accelerate or inhibit production and enzyme activity by attaching to another part of the protein. this changes the shape of the active site which inhibits substrates from bonding and producing more products36
8185508712Activatorone of the allosteric regulators, stabilizes and keeps active site open for production, wedges open37
8185508713Inhiibitorone of the allosteric regulators, doesnt allow active site to work or produce, wedges closed38
8185508714Competitive Inhibitorinhibitor that mimics original substrate by blocking the original substrate39
8185508715Noncompetetitive Inhibitorbind to another part of enzyme to change shape and block substrate from producing40
8185508716Things that impact enzymesenvironment, pH, temp, salinity, chemicals that infuse enzyme, increase activity by increasing substrate concentration41
8185508717exergonicwhat reaction is spontaneous (-G)42
8185508718endergonicwhat reaction is not spontaneous (positive G)43

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