34. What enzyme does the lacZ gene encode?
(A)DNase.
(B) Carbonic anhydrase.
(C) β-galactosidase.
(D)Glucose dehydrogenase.
(E)Succinate dehydrogenase.

30. When cancer cells can migrate to other parts of the body, they are always said to be____. (A)benign (B) invasive (C) metastatic (D)oncogenic (E)genetic

31. Humans have __________ different types of autosomes. (A)11 (B) 22 (C) 33 (D)44 (E)46

32. Meiosis I produces ________, and meiosis II produces _______ cells. (A)2 diploid, 2 haploid (B) 2 haploid, 2 haploid (C) 2 diploid, 4 haploid (D)2 haploid, 4 haploid (E)2 somatic, 2 gametic

33. Sister chromatids separate during _________. (A)metaphase of meiosis I (B) metaphase of meiosis II (C) prophase of meiosis I (D)prometaphase of meiosis I (E)anaphase of meiosis II

35. Which one of the following is the best statement about genomic library and cDNA library? (A)A cDNA library is derived from mRNA by using reverse transcriptase. (B) A genomic library is derived from mRNA by using reverse transcriptase. (C) The number of DNA fragment in genomic library is the same to cDNA library. (D)One DNA sequence can generate one cDNA. (E)Most of DNA sequences from cDNA library are longer than that from genomic library.

36. The Hardy-Weinberg equation stats that p2 + 2pq + q2 = 1; the genotype frequency of heterozygotes is represented by _____. (A)q 2 (B) p 2 (C) 2pq (D)2pq+ p 2 (E)p 2 +q2

37. Animals that lack a vertebral column are known as________. (A)invertebrates (B) inarticulates (C) supinates (D)aspinates (E)retrogrades

38. Which one of the following hormones are not derived from cholesterol? (A)Testosterone. (B) Melatonin. (C) Cortisol. (D)Estradiol. (E)Aldosterone.

39. ________ is a water-soluble hormone derived from the nervous system that regulates blood volume and blood pressure? (A)Cortisol (B) Oxytocin (C) Aldosterone (D)Antidiuretic hormone (E)Adrenocorticotropic hormone

40. Which of the following correctly describes the path of urine from formation to excretion in the mammalian kidney? (A)collecting duct → ureter →  urinary bladder →  renal pelvis→  urethra (B) renal pelvis →  ureter →  urinary bladder →  urethra→ collecting duct (C) ureter →  collecting duct →  renal pelvis → urinary bladder → urethra (D)collecting duct→  renal pelvis→  ureter → urinary bladder →  urethra (E)urethra→ collecting duct→  renal pelvis → ureter →  urinary bladder