AP Biology - ch. 8 questions and answers graded A+

AP Biology - ch. 8 define metabolism - correct answer - sum total of chemical reactions - the totality of an organism’s chemical processes; managing the material and energy resources of the cell two types of reactions in metabolic pathways: ? - correct answer anabolic and catabolic anabolic - correct answer building process such as protein synthesis and net gain of energy in molecules catabolic - correct answer degradative (break down) process such as ceullular respiration; net release of energy from molecules Which reactions release energy? - correct answer catabolic Which reactions consume energy? - correct answer anabolic Which reactions build up larger molecules? - correct answer catabolic Which reactions break down molecules? - correct answer catabolic Which reactions are considered "uphill"? - correct answer anabolic What type of reaction is photosynthesis? - correct answer catabolic What type of reaction is cellular respiration? - correct answer catabolic Which reactions require enzymes to catalyze reactions? - correct answer catabolic, anabolic Contrast kinetic energy with potential energy. - correct answer kinetic - energy of motion potential - stored energy chemical energy - potential energy of molecules Which type of energy does water behind a dam have? A mole of glucose? - correct answer - potential in the form of chemical - a mole of glucose=potential energy by location What is free energy? What is its symbol? - correct answer - portion of system's E that can perform work - delta (triangle) G For an exergonic reaction, is ∆G negative or positive? - correct answer - negative - net release of free E to surroundings. products have less energy - Because the chemical mixture loses free energy, ∆G is negative for an exergonic reaction. Is cellular respiration an endergonic or an exergonic reaction? What is ∆G for this reaction? - correct answer - exergonic - Delta G is negative Is photosynthesis endergonic or exergonic? What is the energy source that drives it? - correct answer - endergonic - sunlight To summarize, if energy is released, ∆G must be what? - correct answer negative List the three main kinds of work that a cell does. Give an example of each. - correct answer 1. mechanical work: ATP phosphorylates motor proteins 2. transport work: ATP phosphorylates transport proteins 3. chemical work: ATP phosphorylates key reactants