Unformatted text preview: stics? Species Richness (A) (B) (C) (D) (E) Higher Higher Same Same Lower Evenness Higher Lower Lower Higher Lower GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 53 Questions 178-181 refer to the following experiment. The two graphs above indicate the relationship between oxygen content and oxygen partial pressure (Po2) in samples of blood taken from two species of vertebrates (species I and species II). Each sample was subjected to two levels of carbon dioxide pressure (Pco2): curve A represents the values measured at normal Pco2 and curve B represents the values measured at elevated Pco2. The blood passing through the lungs of these species normally has a Po2 of 100 millimeters of mercury and the venous blood leaving the tissues has a Po2 of 40 millimeters of mercury. GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 54 178. When curve A for species I is compared to curve A for species II, it can be predicted that the O2 concentration of the blood will be (A) higher in the lung for species I than for species II (B) lower in the lung for species I than for species II (C) higher in species I at all pressures (D) lower in species I at all pressures (E) the same in both species at all pressures 179. If deoxygenated blood samples were exposed to increasing Po2, the first sample to become saturated with O2 would be from which of the following? (A) (B) (C) (D) (E) Species I at normal Pco2 Species I at elevated Pco2 Species II at normal Pco2 Species II at elevated Pco2 There are no differences. 180. Which of the following statements best describes the effect of increased carbon dioxide pressure in the blood of the two species? (A) It affects oxygen affinity and oxygencarrying capacity in one species only. (B) It increases the oxygen affinity but has no effect on oxygen-carrying capacity in either species. (C) It reduces the oxygen affinity and the oxygen-carrying capacity in both species. (D) It reduces oxygen affinity but has no effect on oxygen-carrying capacity in either species. (E) It has no effect on either oxygen affinity or oxygen-carrying capacity in either species. 181. If the Pco2 of arterial blood is equivalent to that used to obtain curve A and if venous Pco2 corresponds to that used to obtain curve B, how much oxygen will be released from a liter of blood as it passes through the tissues in species I ? (A) (B) (C) (D) (E) 20 mL 40 mL 120 mL 160 mL 200 mL GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 55 Questions 182-185 refer to the following model as an example of adaptive radiation and species diversification. One of the classical examples of evolution occurs on the Galápagos Islands with Darwin’s finches. The islands have always been separate from the South American mainland and vary in size and elevation. The lowlands are covered with thorn scrub, while higher elevations (found only on the larger islands) are covered with moist, dense forests. All th...
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- Spring '14