39. G protein-coupled receptors (GPCRs) have ________ transmembrane-domains. When the GPCR binds to a ligand, it activates an associated G protein by exchanging the ________ bound to the G protein for a ________.
(A) Seven, GTP, GDP
(B) Five, GTP, GDP
(C) Seven, GDP, GTP
(D) Five, GDP, GTP
(E) Three, GTP, GDP

35. Which of the following is a neurotransmitter? (A) Glutamate (B) GABA (C) Acetylcholine (D) Dopamine (E) All of above

36. What are minimal features of yeast artificial chromosomes (YAC)? 1. Centromere  2. Promoter 3. Coding genes  4. Telomere  5. Replication origin (A) 1, 2,3 (B) 1,4,5 (C) 2,3 (D) 1,4 (E) 1,2,3,4

37. Which statement of DNA replication is INCORRECT? (A) Okazaki fragments are short DNA fragments that bind to lagging strand (B) Primase add RNA primers onto lagging strand (C) DNA ligase I connects Okazaki fragments (D) Proliferating cell nuclear antigen (PCNA) is a DNA clamp that acts as a processivity factor for DNA polymerase in eukaryotic cells (E) Flap endonuclease 1 (FENI) is responsible for removing RNA primer of an Okazaki fragment

38. What statement of mitochondrion is INCORRECT? (A) Mitochondrial DNA is circular (B) A double-membrane-bound organelle (C) Mitochondrial DNA is inherited from mother (D) ATP is produced by oxidizing pyruvate and NADH in mitochondria (E) One mitochondrion only contains one copy of its DNA

40. Which of the following is not involved in RNA splicing? (A)UI RNA (B) Small nuclear ribonucleoproteins (C) Ribozyme (D) Transesterification (E) Nonsense-mediated mRNA decay

1. Cytosolic proteins are anchored to the plasma membrane by? (1) prenylation (2) S-nitrosylation (3) farnesylation (4) myristoylation (A) (1), (2) or (3) (B) (1), (2) or (4) (C) (1) (3) or (4) (D) (2), (3) or (4) (E) (1), (2), (3) or (4)

2. Which of the following statements regarding cytoskeleton is correct? (1) The plasma membrane of eukaryotic cells is supported by microtubules.  (2) Within an actin filament, each actin subunit is surrounded by 4 neighboring actin subunits. (3) In cells, the y-tubulin ring complex is found at the microtubule (+) end. (A) (1) (B) (2) (C) (3) (D) (1) and (2) (E) (2) and (3)

3. Which of the following is a common intracellular second messenger?(A) adenosine triphosphate (ATP) (B) guanine monophosphate (cGMP) (C) 1,2 diacylglycerol (DAG) (D) Epinephrine (E) Serotonin

複選題4. Eukaryotic mRNA binding to the ribosomes is facilitated by?(A) Kozak consensus sequence (B) the Shine Dalgarno sequence (C) the 7-methyl guanosine cap (D) poly A tail (E) All of above facilitate mRNA binding to the ribosomes.

5. The resting membrane potential in animal cells depends largely on what channel?(A) nongated H⁺ (B) gated Na⁺ (C) nongated Na⁺ (D) gated K⁺ (E) nongated K⁺