複選題

37. A BLAST search is/are done to?
(A) find similar gene sequences.
(B) find similar protein sequences.
(C) find the chromosomal location of a sequence.
(D) find restriction sites and SNPs in a sequence.
(E)predict the three-dimensional structure of a protein from its amino acid sequence.

複選題33. Which of the following statements about the genetic code is/are CORRECT? (A) Bacterial mRNA of 800 nucleotides could code for a 300 amino acid protein. (B) There are at least three codons for each amino acid. (C) A new codon begins every three nucleotides. (D) The fourth codon establishes the reading frame. (E)The genetic code is degenerate because one particular amino acid can be encoded by more than one codon.

34. The site-specific recombinases are similar to topoisomerases in what way? (A) They introduce supercoils. (B) They require ATP hydrolysis for their activity. (C) They promote phosphoryl group transfers in which the net change in free energy is close to zero. (D) They also assist in compaction of the DNA. (E)They mediate strand invasion reactions.

複選題35. DNA sequence rearrangements are involved in the following processes? (A) immunoglobulin gene expression in mammals. (B) transposition of bacteriophage Mu. (C) mating-type switching in yeast. (D) antigen switching in trypanosomes. (E)intron splicing in ciliates.

複選題36. Which of the following base pairs is/are a Wobble base pair? (A) G-U (B) I-C (C) I-A (D) G-C (E)A-U

複選題38. Which of the following techniques is/are used to test for genetic diseases such as fragile X syndrome? (A) RNA-Seq (B) ChIP-Seq (C) Western blotting (D) FISH (Fluorescent in situ hybridization) (E)PCR

複選題39. Polymerases also have nuclease activities. Which of the following is/are a use for the nuclease activities of DNA polymerase I? (A) Proofreading during synthesis (B) Trimming single-stranded ends (C) Removal of RNA primers (D) Degradation of viral DNAs (E)Removal of DNA lesions during repair

複選題40. Which of the following process about the eukaryotic mRNA degradation is/are TRUE? (A) The poly( A ) tail is lengthened. (B) The 5' cap is removed. (C) Degradation is at least partially carried out in processing bodies. (D) The exosome degrades the molecule to component nucleotides. (E)An mRNA molecule containing a hairpin structure in the 3'-UTR that recruits a ribonuclease.

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