50. 某交流RLC串聯電路中，電源頻率為2kHz，R = 10Ω，X_L = 4Ω，X_C = 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.

7. What following enzyme requires FAD as a coenzyme for its catalytic reaction? (A) Acyl-CoA dehydrogenase (B) a-Ketoglutarate dehydrogenase (C) Isocitrate dehydrogenase (D) Malate dehydrogenase (E) Glutamate dehydrogenase

8. How docs glucose 6-phosphate turn on the activity of glycogen synthase? (A) Glucose 6-phosphate can directly activate glycogen synthase via an allosteric regulation. (B) Glucose 6-phosphate can inhibit phosphorylase kinase, leading to giycogen synthase activation. (C) Glucose 6-phosphate is an inducer to turn on glycogen synthase kinase for activation of glycogen synthase. (D) Gluco se 6-phosphate can activate glycogen synthase via phosphorylation by a G6P-dependent kinase. (E) Glucose 6-phosphate can activate phosphoprotein phosphatase-1 for glycogen synthase activation.

9. What following metabolite or product is NOT directly generated from the intermediates of the citric acid cycle in human liver cells? (A) Proline (B) Asparagine (C) Porphyrins (D) Glycine (E) Aspartate

10. What following statement is NOT correct for glucose to stimulate insulin secretion in pancreatic β cells? (A) Blood glucose is taken by pancreatic β cells via glucose transporter GLUT2. (B) Active metabolism of glucose raises intracellular concentrations of ATP. (C) Membrane depolarization results in opening voltage-gated channels. (D) ATP opens potassium ion channels to depolarize the membrane potential for insulin secretion. (E) An increase of cytosolic [] triggers the release of insulin exocytosis.

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