49. Which gene might be associated with the rapid appearance of a vast array of bilaterally symmetrical and structurally diverse animals during the Cambrian explosion?
(A) BRCA genes
(B) Ubx genes
(C) Opsin genes
(D) STX16 genes
(E) Hox genes

45. Regarding plant organ and its components, which of the following sets is NOT true? (A) Spores vs. sperms (B) Archegonia vs. eggs (C) Antheridia vs. sperms (D) Ovules vs. eggs (E) Seeds vs. embryos

46. Which of the following statements about reproductive system and embryonic development is TRUE? (A) The mesoderm of embryonic layer forms skeletal and muscular systems. (B) The primary oocyte is arrested at metaphase of meiosis II. (C) Follicle stimulating hormone (FSH) stimulates the remaining follicular tissue to form the corpus luteum. (D) Luteining hormone (LH) causes sertoli cells to produce testosterone and other androgens. (E) Prostaglandins make the uterus more sensitive to oxytocin to initiate labor.

47. The heterokaryotic phase of a fungal life cycle is______. (A) a stage in which the hyphae contain only one type of haploid nucleus (B) a stage in which the hyphae contain two, genetically different, diploid nuclei (C) a stage in which the hyphae contain two, genetically different, haploid nuclei (D) a stage that is diploid but functions as a gametophyte (like the body of an animal) (E) a triploid stage formed by the fusion of a diploid nucleus with the haploid nucleus of a compatible hypha

48. Regarding the biogeographic factors affecting community diversity and related theories, which is NOT true? (A) Plant and animal life are generally more abundant and diverse in the tropics than in other parts of the globe. (B) All other factors being equal, the larger the geographic area of a community, the more species it has. (C) Small islands generally have higher immigration rate. (D) The species richness of plants and animals correlates with measures of evapotranspiration. (E) An island that is closer to the mainland generally has a higher immigration rate and a lower extinction rate than one farther away.

50. Assuming that 40 leopard cats, weighing 5 kg each and feeding solely on herbivorous prey, live continuously with their prey in a given area, approximately how much total biomass of plant material would be required? (A) 2,222 kg (B) 4,000 kg (C) 20,000 kg (D) 125,000 kg (E) 500,000 kg

51. Which of the following statements about all cells is NOT true? (A) They have membrane transport proteins. (B) They synthesize proteins on the ribosome. (C) They replicate their genome by DNA polymerization. (D) They transcribe their genetic information by RNA polymerization. (E) They use RNA as a template for genomic DNA polymerization.

52. Which is NOT included in the key features of the angiosperm life cycle of plants? (A) Development of embryo sacs (B) Development of male gametophytes (C) Fruits (D) Zygosporangium (E) Double fertilization

53. Which of the following statements about photosynthesis is TRUE? (A) The light reaction in the thylakoids makes NADP+ to the Calvin cycle . (B) Phosphoenolpyruvate (PEP) carboxylase has a higher affinity for CO2 than rubisco does. (C) The oxygen is produced by the electron transfer system of photosystem I (PS I). (D) Photosystem II (PS II) is called P700 because of its reaction-center chlorophyll that absorbs light with a wavelength of 700 nm. (E) C4 plants only use rubisco for carbon fixation.

54. Which of the following statements about viruses is TRUE? (A) Prions replicate using host's translation machinery. (B) Reverse transcriptase in retroviruses converts host cell RNA into viral DNA. (C) A phage that reproduces only by the lytic cycle is called a temperate phage. (D) Human immunodeficiency virus (HIV) are double-stranded DNA virus. (E) Herpesvirus has single stranded RNA that acts as a template for DNA synthesis.

55. About the ABC hypothesis of flowering, which set(s) of organ and gene expression is NOT true? (A) Sepals – A gene activity (B) Petals – A + B gene activity (C) Loss of A gene results in mutation of sepals and petals (D) Carpels – C gene activity (E) Stamens – A + C gene activity