36. A plant stem is girdled so that phloem transport is disrupted but xylem remains intact. Which of the following processes would continue normally immediately after girdling?
(A) Downward movement of sugars from leaves
(B) Pressure-flow-driven sucrose movement
(C) Distribution of amino acids to roots
(D) Translocation of photosynthates to fruits
(E) Long-distance transport of water to leaves

37. In a temperate forest ecosystem, a mutation spreads through fungal populations that prevents the formation of multicellular hyphae, restricting fungi to unicellular growth forms. Although metabolic pathways for enzyme production remain intact, the organisms cannot form extensive filamentous networks in soil or woody substrates. Which ecosystem-level process would most likely experience the greatest decline as a direct consequence? (A) Net primary productivity by autotrophs (B) Atmospheric nitrogen fixation rates (C) Oxygenic photosynthesis in the canopy (D) Breakdown of lignin-rich plant biomass (E) Carbon fixation by soil microbes

38. In chloroplasts, inhibition of photosystem II would most directly reduce the production of _____. (A) NADPH and the proton gradient across the thylakoid membrane (B) ATP generated by substrate-level phosphorylation (C) glucose during the Calvin cycle (D) RuBP regeneration (E) oxygen consumption by mitochondria

39. Which characteristic represents a synapomorphy uniting ecdysozoans (e.g., arthropods and nematodes) and most clearly distinguishes them from other bilaterian invertebrates? (A) Presence of a fluid-filled body cavity (B) Expression of radial body symmetry (C) Periodic molting of an external cuticle (D) Development of repeated body segments (E) Possession of an open circulatory system

40. Which population characteristic is most directly regulated by density-dependent factors? (A) Carrying capacity (K) (B) Birth rate during a catastrophic event (C) Intrinsic rate of increase (r) (D) Dispersal ability (E) Age at sexual maturity

41. According to the pressure-flow model of phloem transport, long-distance movement of sucrose depends primarily on _____. (A) active transport of water into sieve-tube elements at the source (B) capillary forces within sieve plates (C) a pressure difference established between source and sink tissues (D) diffusion of sucrose through plasmodesmata over long distances (E) bulk flow driven by transpiration in xylem vessels

42. A population of 10,000 diploid organisms shows genotype frequencies that initially conform to Hardy–Weinberg expectations. Over the next generation, which of the following scenarios would be expected to produce the largest deviation from Hardy–Weinberg genotype proportions in a single generation? (A) A 1% migration rate from a genetically similar neighboring population (B) Mild inbreeding with an inbreeding coefficient F = 0.05 (C) Occasional mutation at a rate of 10⁻⁶ per allele per generation (D) A temporary reduction of population size to 5,000 individuals (E) Heterozygote disadvantage reducing heterozygote fitness by 50%

43. Which statement best distinguishes inductive reasoning from deductive reasoning in biological research? (A) Deductive reasoning is only applicable to molecular biology. (B) Inductive reasoning always produces falsifiable conclusions. (C) Inductive reasoning tests hypotheses using controlled experiments. (D) Inductive reasoning generates hypotheses based on observed patterns. (E) Deductive reasoning derives general principles from specific observations.

44. Which characteristic represents a derived feature that most clearly distinguishes extant birds from other living reptiles? (A) Presence of keratinized epidermal structures (B) Production of shelled amniotic eggs (C) Maintenance of elevated metabolic temperature (D) Use of internal fertilization mechanisms (E) Modification of forelimbs into feathered wings

45. Which two proteins form the extracellular fibers found in all connective tissues? (A) Collagen and elastin (B) Actin and myosin (C) Keratin and collagen (D) Fibrin and fibrinogen (E) Tubulin and elastin

46. The inactivation of p53 is a near-universal feature of human cancers. What is the most crucial consequence of p53 inactivation for cancer development? (A) It directly activates oncogenes, such as Ras and Myc, leading to uncontrolled cell proliferation. (B) It allows cells to bypass the G1/S checkpoint, leading to a shortened call cycle and faster tumor growth. (C) It prevents the repair of DNA damage, leading to a mutator phenotype and the rapid accumulation of further mutations. (D) It allows cells to survive and proliferate despite cellular stress and DNA damage, conditions that would normally trigger apoptosis or cell-cycle arrest. (E) It promotes angiogenesis and the recruitment of stromal cells to the tumor microenvironment.

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