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• 31. The extinction of plants has severe consequences because:(A) plants do not have the extensive ra
• 32. A woman had several miscarriages. Her doctor suspected that a hormonal insufficiency was causing
• 33. In eukaryotes, what is the active transcription generally associated with?(A) Euchromatin only (
• 34. Which of the following can be used as a cloning vector?(A) E. coli (B) Eco RI (C) lambda phage (
• 35. Which of the following is not true of a codon?(A) It consists of three nucleotides. (B) It may c
• 36. The theory that suggests that eukaryotic organelles such as mitochondria and chloroplasts may ha
• 37. What percentage of the DNA in a typical eukaryotic cell is expressed at any given time?(A) 3-5%
• 38. What hormone is essential for a tadpole to develop into an adult frog?(A) growth hormone (B) ins
• 39. Three kinds of selection occur that cause changes in the normal distribution of phenotypes in a
• 40. In a population that is in Hardy-Weinberg equilibrium, the frequency of the allele a is 0.2. Wha
• 42. What is the important component retain the violet dye in the Gram-positive bacteria cell wall?(A
• 43. Among the invertebrates, arthropods are unique in possessing(A) a notochord. (B) open circulatio
• 44. Important terrestrial adaptations that evolved exclusively in seed plants include all of the fol
• 46. Which of the following definitions of “Animal” is not true?(A) Animals are multicellular eukaryo
• 47. Transport in plants include all of the following except(A) absorption of water and minerals from
• 49. Antibodies of the different classes IgM, IgG, IgA, IgD and IgE differ from each other in(A) the
• 48. A hummingbird with a beak that is too short to pollinate a flower is an example of(A) behavioral
• 50. Which of the following signal transduction molecules is not bound to the plasma membrane?(A) G p
• 51. Reabsorption of useful components of glomerular filtrate occurs in(A) Bowman’s capsule. (B) prox
• 41. Yeast is a member of which division?(A) Ascomycota (B) Zygomycota (C) Basidiomycota (D) Deuterom
• 52. Which of the following is true?(A) The leaves of both angiosperms and gymnosperms are covered by
• 53. Two animal species live in the same biome but on different continents. Although these two are no
• 45. Which of the following enzymes has the lowest pH optimum?(A) lipase (B) pepsin (C) trypsin (D)su
• 54. Suppose a mutation occurred in Drosophila in the region of DNA that codes for the protein called
• 55. What is the basis for the difference in the synthesis of the leading and lagging strands of DNA