33.Which of the following is a DNA molecule?
(A)
(B)
(C)
(D)

34. Which of the following descriptions of ''virus" is   INCORRECT  ? (A) A virus is a small infectious agent that can replicate only inside the living cells of an organism. (B) A virus is composed of protein coat and nucleic acid. (C) The genetic material of a virus is either a double-stranded DNA or a single-stranded RNA. (D) During virus replication, some virus particles may not contain viral genome.

35. During which stage of the cell cycle does DNA replication occur? (A) G1 (B) S (C) G2 (D) M

36. DNA hypermethylation is often associated with (A) gene mutation (B) gene activation (C) gene translocation (D) gene silencing

37. One of the strong pieces of evidence for the process of gene duplication and mutation is the occurrence of (A) introns. (B) transposons. (C) pseudogenes. (D) heterochromatin.

38. If you want to prepare a denaturing protein gel for electrophoresis, you need to have thefollowings:i. polyacryamideii. ammonium sulfateiii. TEMEDiv. β-mercaptoethanol(A) i and ii(B) ii and iii(C) iii and iv(D) All

39. What is the role of the Kozak scquence? (A) Initiation of RNA transcription (B) Initiation of protein translation (C) The ribosomal binding site (D) A transcription factor binding site

40. Which one-letter symbol represents the amino acid lysine? (A) K (B) L (C) R (D) S

41. Which of the following sequences is   NOT   found in a mature mRNA? (A) UTR (B) Exon (C) Intron (D) Stop Codon

42. Which of the following components does   NOT   participate in protein degradation? (A) Ubiquitin (B) Proteasome (C) E3 ligase (D) Lysozyme

43. Which of the followings is a stop codon on mRNA? (A) UAU (B) UAG (C) UGU (D) UUG

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