44. Which of the following is true for the phenomenon of "epistasis" in genetics?
(A) It is a type of gene interaction in which the phenotype expression of one gene alters that of another independently inherited gene.
(B) It is the inheritance of traits transmitted by mechanisms that do not involve the nucleotide
(C) It only occurs in mammals.
(D) It is the mechanism for the inheritance of organelles.
(E) It controls the early development of Drosophila.

40. A man fell from a 1.5 m high platform and bumped the right side of his head directly against the concrete floor. Shortly after the incident, he appeared confused, unsure of his location, time of the day, and the events leading to his fall. He also complained about headaches on his right side. The horizontal CT scan of his head showed a lens-shaped radiopaque inside the right temporal cranium. This patient likely suffered from: (A) skin abrasion (B) subcutaneous bruises (C) epidural hematoma (D) subdural hematoma (E) subarachnoid hemorrhage

41. Which of the following statements about MHC I proteins is true? (A) They are found primarily on immune system cells. (B) They protect a developing fetus from the immune system of mother. (C) They are found on the surface of most mammalian cells. (D) They are antibodies. (E) All of the above are true.

42. Which of the following is the visual evidence of genetic recombination during meiosis? (A) Centromeres (B) Synaptonemal complexes (C) Chiasmata (D) Secondary constrictions (E) Mitotic spindle

43. Mammals are homeostatic for all of the following EXCEPT (A) Body temperature (B) Blood glucose concentration (C) Blood pH (D) Metabolic rate (E) Blood calcium concentration

45. The nontemplate strand of a portion of a gene reads: 5' -TTCACTGGTTCA. What is the sequence of the resulting transcript (RNA) for this portion? (A) 5'-AAGUGACCAAGU (B)5'-UGAACCAGUGAA (C)5'-UUCACUGGUUCA (D) 5'-ACUUGGUCACUU (E) 5'-TGAACCAGTGAA

46. During protein synthesis, which of the following proteins interacts via its N-terminal sequence with the signal recognition particle (SRP)? (A) Nuclear matrix protein (B) Lysosomal protein (C) Ribosomal protein (D) Mitochondrial protein (E) Chloroplast protein sequence.

47. The main function of the atrioventricular (A-V) node is to (A) initiate the heartbeat. (B) set the rhythm of the heartbeat. (C) relay the signal for the heart to contract from the left ventricle to the left atrium. (D) relay a signal for the ventricles to contract. (E) detect the vibration of heart.

48. Which of the following statements about fungi is true? I. They are eukaryotic. Ⅱ. They all have rigid cell walls.III. Most are filamentous.IV. Some are photosynthetic.V. They are capable of only asexual reproduction. (A) I. II. V (B) I. II. III (C) I. II.IV (D) I. II. IV. V (E) I. II. II. IV

49. Which of the following is present in double-stranded cDNA but absent in the corresponding genomic DNA of eukaryotic cells? (A) Promoter sequences (B) A homopolymeric sequence of A:T base pairs (C) Intron sequences (D) 5' and 3'UTRs (E) Exon sequences

50.Which of the followings are the RNA-protein complex: I. Ribosome Il. Nucleosome III. Lysosome IV. Spliceosome V. Telomerase(A) I, II, IV(B) I, II, III, IV(C) I, III, IV, V(D) I, IV, V(E) I, II, II, IV, V