43. Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole?
(A) Ethanol
(B) gibberellins
(C) abscisic acid
(D) ethylene

44. Seeds for desert plants often germinate once abscisic acid is washed away from the seed by water. In this scenario, abscisic acid is acting as a/an (A) hormone that stimulates cell expansion. (B) germination-inhibiting compound. (C) suspensor. (D) hormone to induce the release of sugars from stored starch in the endosperm.

45. The influenza virus is typical of many animal viruses in that is has an envelope composed of lipids and glycoproteins. Which of the following statements about the envelope is ACCURATE? (A) The envelope glycoproteins are encoded by genes found in the host genome. (B) The envelope is inside the capsid. (C) The envelope is obtained from the host cell when the virus buds from the plasma membrane. (D) The envelope is obtained from the host cell upon entry into the cell.

46. You discover a bacteria species in a deep ocean sample that can turn olive oil into pure gold. The bacteria do not replicate well at sea level, and one night all of your "Golden" bacteria die. What can you do to possibly retrieve the gold-making gene from the dead Golden bacteria? (A) Transform a live bacterial strain with the Golden bacteria's DNA. (B) Transduce a live bacterial strain with the Golden bacteria's DNA. (C) Conjugate a live bacterial strain with the Golden bacteria. (D) Transduce the Golden bacteria and then infect a live strain of bacteria with the transducing virus.

47. Pathogenic microorganisms and their hosts live in a close association with one another known as: (A) sociality (B) mutualism (C) parasitism (D) commensalism

48. You are studying the bacteria in the water of a nearby pond. From a 100 mL sample, you use a 0.5 mL subsample to inoculate a plastic dish filled with a semisolid nutrient medium that fosters growth of coliform bacteria. After an appropriate incubation period, you count 100 bacterial colonies growing on the surface of the medium. What conclusion can you make about the coliform bacteria in the pond water? (A) There is approximately one coliform bacterial cell per milliliter. (B) There are approximately 200 coliform bacterial cells per milliliter. (C) There is approximately one coliform bacterial species per milliliter. (D) There are approximately 200 coliform bacterial species per milliliter.

49. Consider a large algal colony like Cladophora or Microcystis, which plays host to a complex biofilm of bacteria. What is a specific benefit the algal host may receive from the relationship? (A) Oxygen (B) Vitamin B12 (C) A physical habitat (D) Glucose

50. An individual human can be thought of as a ________, consisting of a host and a variety of microbes. DNA from saliva or fecal samples, for example, would reveal the DNA genomes of both the host and its symbiotic microbes, known together as the ________. (A) holobiont, hologenome (B) hologenome, holobiont (C) microbiome, microgenome (D) microbiome, hologenome

51. You are observing the embryonic development of a new species in your laboratory. This species has indeterminate development. You note a mutation in which one of the blastomeres (early cells) mutates and loses its function. What do you hypothesize would happen to this being? (A) Nothing—the remaining blastomeres would accommodate the formation of the necessary structures of the embryo. (B) Immediate embryo death—the remaining blastomeres could not accommodate the formation of the necessary structures of the embryo. (C) Uncertain future for the embryo—depending on which blastomere was lost, the remaining blastomeres might accommodate the formation of the necessary structures of the embryo. (D) The embryo would certainly lack some features as a result of the lost blastomere.

52. Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa? (A) Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. (B) The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. (C) Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. (D) Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution.

53. A frog loses its ability to undergo buccal pumping. What must happen to compensate for this loss? (A) The pumping of blood from the atria to the ventricle must increase. (B) The exchange of gases through the skin must increase. (C) The pumping of blood from the ventricle to the body must increase. (D) The diffusion of wastes through the kidneys must increase.

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