15. Supercoiling is necessary for packaging of bacterial DNA. The enzymes that insert or remove supercoils are named:
(A) Topoisomerases
(B) Polymerases
(C) Ligases
(D) Helicases
(E) Endonuclease

11. The 5' End is potentially lost in replication of linear eukaryotic chromosomal DNA. Which molecules or structures are required to prevent the shortening of the 5'end of DNA? (A) DNA gyrase (B) Telomere (C) Telomerase (D) DNA polymerase (E)Helicase

複選題12. Which of the following statements regarding the "Eukaryotic Genome Organization" are CORRECT? (A) In humans, around 30% of the entire genome actually encodes proteins. (B) Non-coding DNA accounts for the majority of the DNA in higher animals and plants. (C) About 50% of the human genome is repeated sequences (or repetitive sequences). (D) Expressed genes are generally found within euchromatin. (E)Genes for ribosomal RNA are usually found in multiple copies.

13. Chromatin states created by histone modifications can be stably inherited through many rounds of cell division. The posttranslational modifications of histones include the following reactions EXCEPT FOR (A) Acetylation (B) Phosphorylation (C) Methylation (D) Ubiquitination (E) Glycosylation

14. When a change in the DNA base sequence that alters a codon so that one amino acid in a protein is replaced with a different amino acid. We call this mutation as (A) Nonsense mutation (B) Missense mutation (C) Synonymous mutation (D) Silent mutation. (E) Insertional mutation

複選題16. RNA polymerases synthesize a new strand of nucleic acid that is complementary to one of the chromosomal DNA strands. Which of the following statements regarding RNA POLYMERASE is CORRECT? (A) RNA polymerases synthesize a strand of ribonucleotides. (B) Like DNA polymerase, RNA polymerases initiates transcription with a primer. (C) Unlike replication, the newly transcribed sequences do not remain base-paired with the template but are displaced after reaching a length of about 10 nucleotides. (D) Most eukaryotes have three different RNA polymerases, including RNA polymerase I, II, and III. (E) RNA Polymerase II is responsible for transcription of mRNA.

17. Which cytoskeleton filament supports slender protrusions of plasma membrane called microvilli or filopodia? (A) Myosin (B) Intermediate filament (C) Actin (D) Microtubule (E) Dynamin

複選題18. Which of the following statements regarding molecular biology techniques are CORRECT? (A) Southern blotting for detection of specific RNA sequences (B) Northern blotting for detection of specific DNA sequences (C) Western blotting for detection of protein expression levels (D) PCR for amplification of specific DNA sequences (E) Chromatin immunoprecipitation for detection of specific proteins that are associated with specific genomic regions

複選題19. Which of the following statement regarding the "Cell Cycle" is CORRECT? (A) DNA is replicated in S phase. (B) The G₁ phase is the interval between mitosis and the onset of DNA replication. (C) These nondividing cells (which may physiologically be extremely active) are in the G2 phase. (D) The G0 phase is the interval between the termination of DNA replication and the onset of mitosis. (E) During M phase, chromosomes and cytoplasm are partitioned into two daughter cells.

20. Which of the following mobile DNAs moves by using an intermediate RNA form? (A) LINES (Long Interspersed Nuclear Elements) (B) Endogenous retrovirus (C) Transposon (D) Retrotransposon (E) LTR retroelements

複選題21. Which of the following is/are a component of a ribonucleotide? (A) Deoxyribose (B) Phosphate group (C) Uracil (D) Adenine (E) Thymine