複選題

14. What are the enzymes that possess RNA-dependent DNA polymerase activity?
(A) Pol I
(B) Klenow fragment
(C) helicase
(D) reverse transcriptase
(E) telomerase

15. What are the mRNA codons that can be recognized by the anticodon 5'-AUG-3' of tRNA? (A) 5'-AUG-3' (B) 5'-UAC-3' (C) 5'-UAU-3' (D) 5'-GUA-3' (E) 5'-CAU-3'

複選題16. Which methods can be used in measuring mRNA level? (A) dot-blot analysis (B) Northern blot analysis (C) real-time PCR (D) ChIP assay (E) comet assay

17. The oxo and amino groups of purines and pyrimidines exhibit (A) lactam-lactim tautomerism (B) keto-enol tautomerism (C) amide-imidic acid tautomerism (D) amine-imine tautomerism (E) all are right.

複選題18. Which of the following characteristics of histones are right? (A) H1 histones are the ones least tightly bound to chromatin (B) H3 and H4 histones form a tetramer containing two molecules of each (H3-H4)2 (C) H2A and H2B histones form dimers (H2A-H2B). (D) H2A, H2B, H3, and H4 are core histones of nucleosomes (E) H1, H2, H3, and H4 histones associate to form the histone octamer.

19. During DNA synthesis, (A) The nascent DNA is always synthesized in the 5' to 3' direction, as DNA polymerases can add a nucleotide only to the 3' end of a DNA strand (B) The initiation of DNA synthesis upon a primer of DNA and the subsequent attachment of the second deoxyribonucleoside triphosphate (C) On the lagging (forward) strand, the DNA is synthesized continuously (D) On the leading (retrograde) strand, the DNA is synthesized in short (1-5 kb) fragments, the so-called Okazaki fragments (E) An enzyme capable of polymerizing DNA in the 3' to 5' direction does not exist in any organism.

複選題20. During cell cycle, (A) The cyclins are a family of proteins whose concentration increases and decreases throughout the cell cycle (B) If DNA damage is detected in either the G1 or the G2 phase of the cell cycle, cells still can progress through the M phase of the cycle. (C) Different cyclin-dependent protein kinases (CDKs) that phosphorylate substrates essential for progression through the cell cycle (D) DNA synthesis occurs during the GO phase of the cell cycle (E) If DNA damage cannot be repaired, such cells undergo programmed cell death.

21. Gene transcription is a multi-step process. Which of the following statement(s) is (are) NOT correct? (A) Repressors direct histone deacetylation at specific genes thereby prevent the transcriptions of genes (B) Activators are composed of DNA binding domain and transactivating domain, which directs histone acetylation or other co-activators to promote gene transcriptions. (C) Purified RNA polymerase II cannot initiate gene transcription without the assistance from general transcription factors that position RNA polymerase II at the start site (D) Enhancers are the transcription-control regions on the genomic DNA. Enhancers contain binding sites for transcription factors (E) None of the above is correct

複選題22. Pre-mRNA is subjective to processing after transcription. Which of the following statement(s) is (are) correct? (A) The 5' cap is added to nascent RNA shortly after transcription initiation. Capping could promote transcription elongation by stimulating phosphorylation of RNA polymerase C-terminal domain (B) Alternative splicing is one of the processing mechanisms. It reduces the number of final protein products encoded by a given region of genomic DNA. (C) Polyadenylation is a process of adding 100-250 adenines at the end of transcripts. It helps to stabilize mature (processed) mRNAs (D) RNA splicing involves two transesterification reactions, which produce excised lariant intron and spliced exons. (E) Splicing involves protein machineries called spliceosome to make the cut and ligation.

複選題23. Which of the following processes regulate the efficient translation of mRNA into protein (A) micro-RNA (B) cytoplasmic polyadenylation of mRNA (C) phosphorylation of 4E-BPs by mTOR (D) nonsense-mediated decay (NMD) that cause rapid degradation of mRNA with a stop codon before the last splice junction. (E) None of above

複選題24. Genome contains not only genes encoding functional proteins but also (A) LTR retrotransposons (B) DNA transposons (C) None-LTR retrotransposons, such as LINEs and SINEs in mammalian genomes (D) regions encoding long non-coding RNA (E) pseudogene sequences

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