49. In flowering plant, which one of the following is true characteristic of the gametophyte stage?
(A) It is the obvious stage such as an oak tree.
(B) Megasporangium
(C) Seed embryo
(D) Gamete producing
(E) Diploid

45. In the lactose operon of E. coli, which one is the description of the product of the lacI gene? (A) Transcriptional activator protein (B) ß-Galactosidase (C) Induces lac operon transcription (D) Binds to the RNA polymerase (E) Binds to the operator

46. In DNA cloning experiments, which vectors can be keeping the largest DNA fragments? (A) Plasmid (B) Bacteriophage lambda (C) Ti plasmid (D) YACs (E) Cosmids

47. The mountain area of the Central Taiwan was deforested by the 921 earthquake in 2000 and has been recovered today. It is an example of _____.(A) secondary succession (B) primary succession (C) climax succession (D) arrival and speciation (E) seral accumulation

48. In human endocrine systems, which one is NOT correct description? (A) Metamorphosis in flatfishes and in amphibians is controlled by growth hormone. (B) Vitamin D is a hormone produced in part by exposure to sunlight. (C) If blood sodium levels rise sharply above normal limits the heart will release more atrial natriuretic peptide. (D) Insulin's effects on reducing blood glucose levels are counteracted by glucagon's actions, which increase blood glucose. (E) It would be reasonable to assume that environmental cues such as photoperiod and temperature might regulate animal reproduction.

50. In eukaryotes there are several different types of RNA polymerase. Which type is involved in transcription of mRNA for a globin protein? (A) ligase (B) RNA polymerase I (C) RNA polymerase II (D) RNA polymerase III (E) primase

Ⅱ.【單選題】51-75 題，每題 2 分，共計 50 分。答錯 1 題倒扣 0.5 分，倒扣至本大題零分為止，未作答，不給分亦 不扣分。 51. In many ways, the regulation of the genes of a particular group of viruses will be similar to the regulation of the host genes. Therefore, which of the following would you expect of the genes of the bacteriophage? (A) regulation via acetylation of histones (B) positive control mechanisms rather than negative (C) control of more than one gene in an operon (D) reliance on transcription activators (E) utilization of eukaryotic polymerases

52. A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. One of her colleagues suggested she try increased methylation of C nucleotides in a mammalian system. Which of the following results would she most likely see? (A) increased chromatin condensation (B) decreased chromatin concentration (C) abnormalities of mouse embryos (D) decreased binding of transcription factors (E) inactivation of the selected genes

53. During splicing, which molecular component of the spliceosome catalyzes the excision reaction? (A) protein (B) DNA (C) RNA (D) lipid (E) sugar

54. A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates _____. (A) the blending model of genetics (B) true-breeding (C) dominance (D) a dihybrid cross (E) the mistakes made by Mendel

55. If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis be arrested? (A) anaphase (B) prophase (C) telophase (D) metaphase (E) interphase