Unit 3 AP Bio Test Questions and Answers |100% Pass

Unit 3 AP Bio Test Questions and Answers |100% Pass What does the chemiosmotic process in chloroplasts involve? - Answer️️ -A) establishment of a proton gradient In glycolysis, for each molecule of glucose oxidized to pyruvate - Answer️️ -B) 2 molecules of ATP are used and 4 molecules of ATP are produced. In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP? - Answer️️ -D) energy released from movement of protons through ATP synthase Which statement describes the functioning of photosystem II? - Answer️️ -D) The electron vacancies in P680 are filled by electrons derived from water. The primary role of oxygen in cellular respiration is to - Answer️️ -B) act as an acceptor for electrons and hydrogen, forming water. During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level? - Answer️️ -E) FADH2 Which of the following is likely to lead to an increase in the concentration of ATP in a cell? - Answer️️ -B) an increase in a cell's catabolic activity What wavelength of light in the figure is most effective in driving photosynthesis? - Answer️️ -A) 420 mm Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM Page | 2 photosynthesis. Why are they different? - Answer️️ -D) Other pigments absorb light in addition to chlorophyll a. The oxygen consumed during cellular respiration is involved directly in which process or event? - Answer️️ -B) accepting electrons at the end of the electron transport chain In a plant cell, where are the ATP synthase complexes located? - Answer️️ -D) A and C....thylakoid membrane & plasma membrane Where does the Calvin cycle take place? - Answer️️ -A) stroma of the chloroplast Photorespiration lowers the efficiency of photosynthesis by preventing the formation of - Answer️️ -B) 3-phosphoglycerate molecules Which metabolic pathway is common to both cellular respiration and fermentation? - Answer️️ -D) glycolysis Why are C4 plants able to photosynthesize with no apparent photorespiration? - Answer️️ -B) They use PEP carboxylase to initially fix CO2 . What are the products of linear photophosphorylation? - Answer️️ -C) ATP and NADPH The ATP made during glycolysis is generated by - Answer️️ -A) substrate-level phosphorylation. The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction - Answer️️ -B) loses electrons and loses energy. Which of the following is an example of potential rather than kinetic energy? - Answer️️ -D) a food molecule made up of energy-rich macromolecules ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM Page | 3 When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a hydrogen ion) the molecule becomes - Answer️️ -C) reduced. What is proton-motive force? - Answer️️ -B) the transmembrane proton concentration gradient CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they - Answer️️ -fix CO2 into organic acids during the nig