31. Huntington disease is caused by_________.
(A)pyrimidine dimers
(B) trinucleotide expansion
(C) suppressor mutants
(D)ionic radiation
(E)none of the above

32. How does RecA bring about strand exchange? (A)RecA acts as a helicase, unwinding DNA in localized regions (B)RecA monomers bind to ssDNA to form a nuclcoprotein filament (C) RecA monomers interact only with ssDNA and immediately dissociate when binding to dsDNA (D)RecA forms a tetramer that wraps aro und DNA at specific sites that must be cleaved by a nuclease (E)none of the above

33.What enzyme is responsible for unwinding of the DNA ahead of the replication fork? (A)topoisomerase (B)primase (C) clamp loading complex (D)helicase (E)single-stranded binding protein

34.Which of the following is the best description for primase? (A)an RNA-dependent DNA polymerase (B) a DNA-dependent DNA polymerase (C) an RNA-dependent RNA polymerase (D)a DNA-dependent RNA polymerase (E)none of the above

35.For a restriction enzyme with a 6-base recognition site, what is the average number of base pairs between occurrences of the site? (A)1024 base pairs (B) 4096 base pairs (C) 46656 base pairs (D)186624 base pairs (E)none of the above

36.EcoRI has a restriction site of GLAATTC while EcoRV has a restriction site of GATVATC. Based upon this, EcoRI produces___________ and EcoRV produces___________. (A)a5' overhang；a 3' overhang (B)a 5' overhang； a 5' overhang (C) a5' overhang； blunt ends (D)a 3' overhang； a 5' overhang (E)a 3' overhang； blunt ends

37. Which of the following describes the correct sequence of enzyme activity upon the lagging strand? (A)primase, DNA ligase, DNA polymerase I, DNA polymerase IIl (B) primase, DNA polymerase I, DNA polymerase III, DNA ligase (C) primase, DNA polymerase III, DNA polymerase I, DNA ligase ((D)primase, DNA ligase, DNA polymerasc IIl, DNA polymerase I (E)DNA polymerase IIl, primase, DNA polymerase I, DNA ligase

1. A monopolistically competitive industry is characterized by (A) many firms selling products that are similar but not identical. (B) many firms selling identical products. (C) a few firms selling products that are similar but not identical. (D) a few firms selling highly different products.

2. Suppose that some country had an adult population of about 46 million, a labor-force participation rate of 75 percent, and an unemployment rate of 8 percent. How many people were unemployed? (A) 2.54 million. (B) 2.76 million. (C) 3.68 million. (D) 8 million.

3. Which of the following statements is not correct? (A) In the long run, there are no fixed costs. (B) Marginal cost is independent of fixed costs. (C) Economies of scale is a short-run concept. (D) Diminishing marginal product explains increasing marginal cost.

4. Monetary neutrality implies that an increase in the quantity of money will (A) increase employment. (B) increase the real interest rate. (C) increase the incentive to save. (D) increase the price level.

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