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• 9.A drug that interferes with microtubule formation is likely to completely disrupt _______ . (A)th
• 10.Which of the following scenarios describes an example of epistasis? (A)Albino corn snake result f
• 11.If, on average, 48% of the loci in a species' gene pool are heterozygous, then the average h
• 12.The Casparian strip of the endodermis stops water from the _______ before it reaches the stele. (
• 13.What is the function of reverse transcriptase in retroviruses? (A)It uses viral RNA as a template
• 14.Under what conditions do photosynthesis and cellular respiration occur in plants? (A)Photosynthes
• 15.What would be the expected effect on C3 and C4 plants if the atmospheric CO2 concentration was do
• 16.Aquaporins _______ . (A)allow water to cross the plasma membrane along its concentration gradient
• 17.Which of the following are the male gametophytes in flowering plants? (A) stamens(B) shoot parts
• 18.Which of the following best describes double fertilization in flowering plants? (A)Flowers must b
• 19.The following steps occur during a plant's response to drought stress.I)ABA accumulates in t
• 20.Which of the following events is most immediately associated with the absorption of energy by chl
• 21.The genetic code is essentially the same for all organisms. From this, one can logically assume w
• 22.E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more
• 23.Put the following steps of DNA replication in the proper order. 1.Single-stranded binding protein
• 24.You want to engineer a eukaryotic gene into a bacterial colony and have it expressed. What must b
• 25.In a species that alternates between sexual and asexual reproduction, under which of the followin
• 26.Injury to the hypothalamus would most likely disrupt _________ . (A) regulation of food appetite
• 27.When fat enters tiie duodenum, it stimulates release of _________ . (A) secretin (B) cholecystoki
• 3.Which of the following reactions differs from the others in terms of the cellular mechanism? (Sele
• 4.When a healthy young man stands up abruptly after lying down, the veins in the lower itmbs become
• 5.In vertebrates, the binding of acetylcholine to the ligand-gated ion channels of a skeletal muscle
• 39.Calculate the recoil velocity of a 5-kg rifle that shoots a 0.02-kg bullet at a speed of 620 (m\
• 30. 基數=？ (A)(B)(C)(D)
• 40.Neglect the friction and weights of pulleys and cord in the figure. The body of mass m2 is fallin