【GR1724】 The Solution for GRE Biology Practice Test [81-100]

The Solution for GRE Biology Practice Test [81-100]

 

추천글 : 【GRE】 Solution for GRE Biology Practice Test 

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81. All of the following characteristics are typical of r-selected species EXCEPT

 

 

⑴ answer: E

⑵ A mouse is an r-selected species, and a human is a k-selected species. 

 

 

82. Which of the following active pools of carbon is the largest on Earth and contributes the most to carbon cycling?

 

 

⑴ answer: E

 

 

83. Which of the following characteristics is predicted for an early-successional plant community?

 

 

⑴ answer: B

⑵ plant succession : transition → herbs → shrubs → trees → shade-intolerant species → shade-adapted species 

 

 

84. An aspect of the natural world that developed primarily as a result of biological processes is Earth's 

 

 

⑴ answer: A

⑵ Oxygen was generated by cyanobacteria about 2 billion years ago.

 

 

85. The graph below shows the photosynthetic response of three coexisting plant species, X, Y, and Z, to a gradient of light intensity. Based on these response curves, which of the following is most likely true?

 

 

⑴ answer: C

⑵ light intensity and photosynthesis rate 

 

Figure. 1. light intensity and photosynthesis rate

 

 

86. Hardy-Weinberg equilibrium generally assumes all of the following EXCEPT

 

 

⑴ answer: B

 

 

87. Most of the world's major deserts occur in two latitudinal bands that are centered at 30° north and 30° south latitude. This pattern is best explained by 

 

 

⑴ answer: E

⑵ atmospheric circulation : Hadley cell, Ferrell cell, polar cell

 

Figure. 2. atmospheric circulation

 

 

88. The figures below show the results of an experiment in which two microbial species, A and B, were grown in three treatments. In treatment Ⅰ, species A was grown alone. In treatment Ⅱ, species B was grown alone. In treatment Ⅲ, both species were grown together at the same starting densities as in (Ⅰ) and (Ⅱ). The results suggest the interaction is best described as 

 

 

⑴ answer: E

⑵ Species A and B can grow better when together.

 

 

89. The process in which pioneer species colonize a bare substrate such as rock, sand, or glacial till is known as 

 

 

⑴ answer: D

⑵ primary succession

 

 

90. Natural enemies have been implicated as a strong selective force for all of the following EXCEPT

 

 

⑴ answer: D

 

 

91. Gene flow between populations results in 

 

 

⑴ answer: A

⑵ examples of horizontal gene transfer 

 

 

92. Keystone species are thought to have profound effects on the structure and composition of ecological communities because they

 

 

⑴ answer: E

⑵ A type of starfish that feeds on mussels also plays this role, and without them, the mussel population would explode and pose a major threat to the ecology of other species.

 

 

93. Among primates, a high degree of sexual dimorphism in a species usually indicates intense competition between

 

 

⑴ answer: B

 

 

94. A species of small rodent eats seeds from only one species of pine. In normal years, a pair of these rodents will have a litter of two or three. It is unusual for small rodents to have such small litter sizes. The rodents are most likely to exhibit which other characteristic?

 

 

⑴ answer: B

 

 

95. In Sweden, the red fox (Vulpes vulpes) severely limits populations of its prey, including hares. However, red fox populations are sometimes attacked by a fatal parasite, the mange mite. As mite population sizes increase at a given site, how are hare and fox populations most likely to respond at the same time? (Assume that hares have no major predators at this site other than foxes.)

 

 

⑴ answer: C

 

 

96. The figure below shows population growth trajectories over time (as indicated by the arrows) of two stored-grain beetle species when grown together under constant conditions. Three experiments were performed that differed only in the initial densities of the two species. Which of the following is the best interpretation of the experimental results?

 

 

 

⑴ answer: D

⑵ The degree of competitions is the minimum at the converged point, (400, 200).

 

 

97. Aggressive ants live in the swollen thorns of a small tropical tree and feed on oil-rich bodies that the tree produces at the tips of its leaflets. Which of the following experiments best tests the hypothesis that ants defend the plant by either killing or chasing away leaf-feeding insects?

 

 

⑴ answer: A

 

 

98. Which of the following factors does NOT promote linkage disequilibrium?

 

 

⑴ answer: E

⑵ linkage disequilibrium ≒ lack of Hardy-Weinberg equilibrium

 

 

99. A species of goose nests on both cliffs and beaches near the ocean. Soon after hatching, all chicks must make their way to the ocean. Chicks from cliff nests must tumble down the cliff to get to the ocean, and many are killed by the fall. Which of the following is most consistent with the hypothesis that cliff nesting is adaptive in this goose species?

 

 

⑴ answer: B

 

 

100. The A-B-O blood group locus in humans contain 3 alleles. In the Japanese population, the frequencies of these alleles, I^A, I^B, and i, are approximately 0.28, 0.17, and 0.55, respectively. If the Japanese population is in Hardy-Weinberg equilibrium at this locus, which of the following is closest to the expected frequency of heterozygotes at this locus in the Japanese population?

 

 

⑴ answer: D

⑵ 1 - (0.28² + 0.17² + 0.55²) =  0.5902

 

입력: 2023.05.16 00:52