AP Biology MCQ Practice Exam #1 Questions and Answers | 100% Pass

AP Biology MCQ Practice Exam #1 Questions and Answers | 100% Pass Humans produce sweat as a cooling mechanism to maintain a stable internal temperature. Which of the following best expalins how the properties of water contribute to this physiological process? - Answer️️ -The high heat of vaporization of water allows the body to remove excess heat through a phase change of water from liquid to gas. A student placed a semipermeable membrane inside a U-shaped channel with two chambers. Membrane permits the movement of water but not salt. The student wants to vary the rate of osmosis that occurs across the membrane. Which experimental design will result in the fastest net rate of water movement into chamber A? - Answer️️ - Placing salt in chamber A and distilled water in chamber B. What best describes the role of water in photosynthesis? - Answer️️ -Water molecules donate electrons to the electron transport chain. What evolutionary advantage does compartmentalization of core metabolic processes offer eukaryotes? - Answer️️ -Evolution of a nucleus in eukaryotes separates the processes of transcription and translation and they can be regulated separately. Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl- CoA is further metabolized in the Krebs cycle. A researcher measured the accumulation of acetyl-CoA in a reaction containing pyruvate and pyruvate dehydrogenase under several different conditions ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM Page | 2 5. Which of the following best describes the cellular location where pyruvate dehydrogenase is most likely active? 6. The maximum production rate of acetyl-CoA under condition 1 is closer to which of the following? 7. Which of the following observations provides the best evidence that acetyl-CoA negatively regulates pyruvate dehydrogenase activity? 8. Which of the following best explains the buildup of lactic acid in individuals with the mutation? - Answer️️ -5. The mitochondrial matrix 6. 1 micromole/sec 7. The rate of pyruvate dehydrogenase-catalyzed reaction is slower in the presence of a higher concentration of acetyl-CoA 8. Cells undergo fermentation because pyruvate cannot be metabolized to proceed into the Krebs cycle Which of the following best explains how water is able to move upward from the roots of a plant, through its xylem in the stem, and out to the leaves? - Answer️️ -Water and the xylem are both polar. Water molecules have the ability to form hydrogen bonds with each other and with the walls of the xylem. In a study, researchers determined the intracellular location of protein X in cultured cells both before and after exposing the cells to the signaling molecule. Results shown below Based on results, which best describes what protein X is? - Answer️️ -Protein X is a transcription factor. ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM Page | 3 Which of the following best explains the presence of prolactin in various vertebrate species? - Answer️️ -Prolactin is a homologous hormone because it has a common origin but different functions in various species. 12. Which of the follwing best describes the production of DMSP by coral and coral symbionts? 13. Which of the following best describes the effect of temperature on corals' ability to produce DMSP as shown in Figure 1? 14. Which of the following best describes the difference between the total amount of DSMP produced by adults compared to juveniles at the start of the 32C trial. 15. In addition to the effect of temperature on DMSP produced by corals and theri symbionts, whcih of the following relationships is also being