Biology 151 Quizzes 1-3 Exam A+ Pass

Biology 151 Quizzes 1-3 Exam A+ Pass During respiration, electrons are transferred to NAD+. In this process, the NAD+ becomes A) Hydrolyzed. B) Oxidized C) Reduced. D) Condensed. E) Redoxisicated. - Answer - C When a molecule of oxygen moves from outside of a eukaryotic cell to eventually be reduced by Complex IV of the electron transport chain, how many phospholipid bilayers does it need to cross? A)0 B) 1 C)2 D)3 E) All of the above are true - Answer - D Which of the following statements (A-D) is NOT a true statement about a carbon atom that started in a molecule of glucose within a eukaryotic cell. If all statements, A-D, are true, select E. It could eventually be found: A. in the cytosol. B. in the compound, pyruvate. C. as CO2. D. in the mitochondrion. E. All of the above are true. - Answer - E How is NADH oxidized during fermentation? A) Electrons are transferred to pyruvate. B) Electrons are transferred to complex I of the electron transport chain. C) Electrons are transferred to water. D) Electrons are transferred to acetyl CoA. E) Electrons are transferred to oxygen. - Answer - A Chemical reactions that occur spontaneously: A) are endergonic. B) require ATP to make them occur. C) have a negative change in Gibbs free energy. D) are always anabolic. E) occur only during glycolysis. - Answer - C The reaction of glucose with phosphate to produce glucose-phosphate generates +13.8 KJ/mol. Given this information, what assumption about the reaction must be correct? A) The reaction is endergonic. B) The reaction requires molecular oxygen (O2). C) The reaction is spontaneous. D) The reaction occurs in the matrix. E) The reaction is part of the Calvin cycle. - Answer - A or C Catabolic reactions are those that: A) break down complex molecules within the cell. B) generate complex molecules from simpler building blocks within C) the cell. D) use ATP. E) occur spontaneously, but only when enzymes are present. involve only sleepy kittens. - Answer - A The chemical, dinitrophenol, makes a pore (or hole) in the inner mitochondrial membrane that lets protons easily move across this membrane. What would happen when you treat a mitochondrion in an animal cell with this chemical? A) Glycolysis would stop, as pyruvate is transformed into lactate or ethanol. B) The electron transport chain would cease to function, as NADH accumulates. C) All ATP synthesis in the cell would immediately stop. D) The mitochondrial electron transport chain would be unable to accept electrons from NADH. E) None of the above would occur. - Answer - E Which of the following (A-D) is NOT a biologically relevant form of energy? If A-D are all biologically relevant forms of energy, select E A. Chemical energy (stored in bonds) B. Concentration gradient across membranes C. Electrons D. Light E. All of the above are biologically relevant forms of energy - Answer - E Which of the following (A-D) is NOT produced during the Krebs cycle? If A-D are all produced during the Krebs cycle, select E. A. ATP B. NADH C. CO2 D. Pyruvate E. All of the above are produced by the Krebs cycle. - Answer - D Two functions performed by the mitochondrial electron transport chain are: A) movement of protons across the mitochondrial inner membrane and the addition of electrons to oxygen. B) generation of both NADH and FADH2 for use in glycolysis and the Krebs cycle. C) generation of CO2 from sugar and H2O by adding electrons to water. E) catabolism of NAD+ to release CO2 during glycolysis. D) None of the above is an important function performed by the electron transport chain. - Answer - A Which molecule is the final (or terminal) electron acceptor for cellular respiration? A) O2 B) Glucose C) H2O D) CO2 E) NADP+ - Answer - A Where in the cell could you find the nitrogenous base, Guanine (G)? A) the nucleus B) mitochondria C) chloroplasts D) all of the above contain guanine E) None of the above contain guanine - Answer - D