資訊推薦

• 21. What is a distinctive feature of the chondrichthyans?(A) an amniotic egg.(B) unpaired fins.(C) a
• 22. Land plants are composed of all the following tissue types except(A) mesodermal.(B) epidermal.(C
• 23. A plant developed a mineral deficiency after being treated with a fungicide. What is the mostpro
• 24. What soil(s) is(are) the most fertile?(A) humus only.(B) loam only.(C) silt only(D) both humus a
• 25. In flowering plants, pollen is released from the(A) anther.(B) stigma.(C) carpel(D) filament
• 26. According to modern ideas about phototropism in plants(A) light causes auxin to accumulate on th
• 27. According to modern ideas about phototropism in plants(A) many densely-packed cells without an e
• 28. Foods eaten by animals are most often composed largely of macromolecules. This requires theanima
• 29. Which sequence of blood flow can be observed in either a reptile or a mammal?(A) left ventricle
• 30. Where are semilunar valves to be found in the mammalian heart?(A) where blood goes from atria to
• 31. Histamines trigger dilation of nearby blood vessels, and increase in their permeability. Which o
• 32. Which of the following cell types are responsible for initiating a secondary immune response?(A)
• 33. Which of the following nitrogenous wastes requires hardly any water for its excretion?(A) amino
• 34. Materials are returned to the blood from the filtrate by which of the following processes?(A) fi
• 35. What do nitric oxide and epinephrine have in common?(A) They both function as neurotransmitters.
• 36. Prostaglandins are local regulators whose basic structure is derived from(A) oligosaccharides.(B
• 37. Environmental cues that influence the timing of reproduction generally do so by(A) increasing th
• 38. Internal and external fertilization both(A) produce zygotes.(B) occur only among invertebrates(C
• 39. Contact of an egg with signal molecules on sperm causes the egg to undergo a brief(A) mitosis.(B
• 40. In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the(A) acros
• 41. Which of the following properties or processes do we associate with living things?(A) evolutiona
• 42. Organisms interact with their environments, exchanging matter and energy. For example, plantchlo
• 43. Testosterone and estradiol are(A) nucleic acids.(B) carbohydrates.(C) proteins.(D) steroids.
• 44. Which of the following is true of cellulose?(A) It is a polymer composed of sucrose monomers.(B)
• 45. Which type of organelle is primarily involved in the synthesis of oils, phospholipids, andsteroi