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18. 距鐵路軌道中心多少公尺以外、多少公尺以內之明線或未含金屬遮蔽之通信線路,與鐵 路平行之長度超過一公里以上者,應對電力干擾採取適當之防護措施? (A)五公尺以外、三十公尺以內 (B)五公尺以外、四十公尺以內 (C)十公尺以外、三十公尺以內 (D)十公尺以外、四十公尺以內

20. 為維護鐵路興建及行車安全,交通部得依鐵路特性,會同當地直轄市或縣(市)政府於鐵 路兩側勘定禁建、限建範圍。禁建、限建範圍內,不得有下列何項行為?該項行為經交 通部許可採取必要措施者,不在此限。 (A)建造鐵路與其站體 (B)連通設施 (C)廣告物之設置 (D)鐵路附屬設施

21. 為維護鐵路興建及行車安全,交通部得依鐵路特性,會同當地直轄市或縣(市)政府於鐵 路兩側勘定禁建、限建範圍。禁建、限建範圍之劃定、公開展覽、公告、變更、廢止、 禁建範圍之禁止行為、拆除補償、限建範圍之管制行為、管制規範、申請、審查、管理 及處分等相關事項之辦法,由交通部徵詢哪一個單位後會同哪一個單位定之? (A)地方政府、內政部 (B)鐵路管理機構、鐵道局 (C)地方政府、鐵道局 (D)鐵路管理機構、內政部

19.Which of the following amino acid substitutions is most likely to disrupt the formation of a 'heptad repeat' motif in a leucinezipper protein, assuming the substitution occurs at the 'a'or 'd' position of the (abcdefg)n sequence?(A) Leucine to Isoleucine.(B) Leucine to Valine.(C) Leucine to Aspartate.(D) Leucine to Methionine.(E) Leucine to Alanine.

20.A purified peptide was treated with Cyanogen Bromide (CNBr), resulting in two fragments. Treatment of the original peptide with Trypsin yielded three fragments. Chymotrypsin treatment resulted in no cleavage. Recall the specific cleavage sites for Trypsin (positively charged side chains) and Chymotrypsin (aromatic side chains). Which sequence is consistent with these findings? (A) Met-Gly-Phe-Lys-Ala-Gly (B) Ala-Met-Lys-Arg-Gly-Gly (C) Arg-Lys-Met-Tyr-Ser-Gly (D) Gly-Met-Arg-Lys-Trp-Gly (E) Lys-Met-Phe-Arg-Ala-Gly

21. In the context of Hemoglobin (Hb) allostery, the 'Perutz Mechanism' describes the transition from the T-state to the R-state.Which molecular event triggers the movement of the F-helix?(A) The formation of salt bridges between carbamylated N-termini.(B) The release of 2,3-BPG from the central cavity.(C)The dissociation of the alpha-beta dimers into monomers.(D) The transition of the heme iron from high-spin to low-spin state upon oxygen binding.(E) The expulsion ofwater molecules from the distal heme pocket.