46. 110V, 60Hz之電壓源連接一RLC串聯電路，其中R = 3Ω，L = 0.05 H，C = 40μF，求平均 電功率為何？
(A) 16.03W
(B) 0W
(C) -16.03 W
(D) 32 W

47. 並聯3個電容值分別為1μF、2μF及4μF的電容，其等效電容值為多少？ (A) 1μF (B) 2μF (C) 7μF (D) 8μF

48. 在交流RLC並聯電路中，交流電源v(t)=10sin(100t)V，R = 2Ω，XL= 10Ω，若該電路屬於 電容性，而導納的相角為60°，則該電容抗值約為何？ (A) 0.5Ω (B) 1Ω (C) 2Ω (D) 4Ω

49. 將電壓100V頻率159Hz的交流電源接於RL串聯電路中，若流經電阻的電流為4A，兩端電 壓降為60V，則電感值最接近下列何者？ (A) 40mH (B) 30mH (C) 20mH (D) 10mH

50. 某交流RLC串聯電路中，電源頻率為2kHz，R = 10Ω，XL = 4Ω，XC = 25Ω，則該電路的 諧振頻率為何？ (A) 10kHz (B) 5kHz (C) 2.5kHz (D) 1kHz

1. In homologous recombination in E. coli, the protein that moves along a double-stranded DNA, unwinding the strands ahead of it and degrading them, is: (A) RuvC protein (resolvase) (B) RecBCD enzyme (C) RecA protein (D) DNA ligase (E) chi

2. Which of these enzymes is NOT directly involved in methy!-directed mismatch repair in E. coli? (A) DNA polymerase III (B) DNA glycosylase (C) DNA helicase II (D) Exonuclease I (E) DNA ligase

3. In contrast to bacteria, eukaryotic chromosomes need multiple DNA replication origins because: (A) they have a variety of DNA polymerases for different purposes, and need a corresponding variety of replication origins. (B) the processivity of the eukaryotic DNA polymerase is much less than the bacterial enzyme. (C) eukaryotic genomes are not usually circular, like the bacterial chromosome is. (D) eukaryotic chromosomes cannot usually replicate bidirectionally.(E) it would take too long with only a single origin per chromosome.

4. The function of the eukaryotic DNA replication factor PCNA (proliferating cell nuclear antigen) is similar to that of the B-subunit of bacterial DNA polymerase III in that it: (A) forms a circular sliding clamp to increase the processivity of replication. (B) increases the speed but not the processivity of the replication complex. (C) has a 3' 5' proofreading activity. (D) facilitates replication of telomeres. (E) participates in DNA repair.

5. What two amino acids are required for the formation of dehydroxylysinonorleucine in collagen? (A) Leucine and isoleucine (B) Lysine and lysine (C) Tyrosine and isoleucine (D) Leucine and proline (E) Lysine and proline

6. What following statement is NOT a characteristic or function of RNAs? (A) Some RNAs can function as an enzyme. (B) RNAs can have a function to be a genetic information. (C) Except mRNAs, there is no other RNA in ribosomes. (D) RNAs can be used as a carrier of an amino acid. (E) None of the above.

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