Bio Sci 93 Midterm 2 Practice Questions with Verified Answers

Bio Sci 93 Midterm 2 Practice Questions with Verified Answers Catabolism is to anabolism as ___________________ is to ___________________. a.) exergonic; spontaneous b.) exergonic; endergonic c.) free energy; entropy d.) work; energy b Most cells cannot harness heat to perform work because a.) heat does not involve a transfer of energy. b.) cells do not have much thermal energy; they are eventually cool. c.) temperature is usually uniform throughout a cell. d.) heat can never be used to do work. c Which of the following metabolic processes can occur without a net influx of energy form some other process? a.) ADP + P - ATP+H2O b.) C6H12O6 + 6H2O - 6CO2 + 6H2O c.) 6CO2 + 6H2O - C6H12O6 + 6H2O d.) Amino Acids - Protein b If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to a) add more of the enzyme. b) heat the solution to 90 degrees C. c) Add more substrate. d) Add a noncompetitive inhibitor. a Some bacteria are metabolically active in hot springs because a) they are able to maintain a lower internal temperature. b) High temperatures make catalysis unnecessary. c) their enzymes have high optimal temperatures. d) their enzymes are completely insensitive to temperature. c The immediate energy source that drives ATP synthesis by ATP Synthase during oxidative phosphorylation is the a) oxidation of glucose and other organic compounds b) flow of electrons down the electron transport chain c) H+ concentration gradient across the membrane holding ATP Synthase d) Transfer of phosphate to ADP c Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule? a) the citric acid cycle b) the electron transport chain c) glycolysis d) reduction of pyruvate to lactate c The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is a) Oxygen b) Water c) NAD+ d) Pyruvate a In Mitochondria, exergonic redox reactions a) are the source of energy driving prokaryotic ATP synthesis. b) provide the energy that establishes the proton gradient c) reduce carbon atoms to CO2 d) are coupled via phosphorylated intermediates to endergonic processes b Which is the oxidizing agent in the following reaction? Pyruvate + NADH + H+ - Lactate + NAD+