資訊推薦

• 53. Which of the following are responsible for high levels of O2 in Earth's atmosphere?(A) phot
• 54. What is the primary ecological role of prokaryotes?(A) parasitizing eukaryotes, thus causing dis
• 55. Which group includes members that are important primary producers in ocean food webs, causes red
• 56. Which of the following is a secondary compound of embryophytes?(A) adenosine triphosphate(B) alk
• 57. What is the correct sequence of the following four events during an animal's development?(A
• 58. A terrestrial mollusc without a shell belongs to which class?(A) chitons(B) bivalves(C) gastropo
• 59. The ray-finned fishes are characterized by(A) a bony endoskeleton, operculum, and usually a swim
• 60. The opening of stomata is thought to involve(A) an increase in the osmotic concentration of the
• 61. What should be added to soil to prevent minerals from leaching away?(A) humus(B) sand(C) mycorrh
• 62. Which of the following essential nutrients plays an essential role in the opening and closing of
• 63. All of the following are primary functions of flowers except(A) pollen production(B) photosynthe
• 64. The plant hormone involved in aging and ripening of fruit is(A) auxin(B) ethylene(C) florigen(D)
• 65. Interstitial fluid(A) is the fluid inside the gastrovascular cavity of Hydra(B) is the internal
• 66. An example of a connective tissue is the(A) skin(B) nerves(C) blood(D) smooth muscles
• 67. The mammalian trachea and esophagus both connect to the(A) large intestine.(B) stomach(C) pharyn
• 68. In which of the following would you expect to find an enlarged cecum?(A) rabbits, horses, and he
• 69. Which of the following would be described as a portal system?(A) an area connecting arterioles t
• 70. Which of the following are the only vertebrates in which blood flows directly from respiratory o
• 71. How do antibodies of the different classes IgM, IgG, IgA, IgD, and IgE differ from each other ?(
• 72. Which of the following are T cells of the immune system?(A) CD4, CD8, and plasma cells(B) cytoto
• 73. The advantage of excreting wastes as urea rather than as ammonia is that(A) urea can be exchange
• 74. What is the main nitrogenous waste excreted by birds?(A) ammonia(B) nitrate(C) nitrite(D) uric a
• 75. Which of the following does not represent a chemical signal?(A) movement of a signal from one en
• 76. The hypothalamus controls the anterior pituitary by means of(A) releasing hormones(B) second mes
• 77. Internal and external fertilization both(A) produce zygotes(B) occur only among invertebrates(C)