複選題
78.水中總氮的計量會納入下列哪些化合物？
(A)硝酸鉀
(B)醋酸銨
(C)氮氣
(D)尿素。

複選題79.下列何種檢測結果須以儀器判讀完成？(A)氯鹽(B)氨氮(C)硫酸鹽(D)鹼度。

複選題80.關於採樣容器的敘述何者錯誤？(A)採集揮發性有機物應使用棕色玻璃瓶，且瓶蓋內應附有 鐵氟龍(PTFE)的襯裏(B)採集多氯聯苯項目時必須 使 用玻璃 容 器 盛裝 (C) 採集之 水 樣 若使 用 正 確 的 容器 ， 且添加 保 存 試劑 ， 水質即 不 會 產生 變 化 (D)採 集 農 藥項 目 時可以 使 用 塑膠 瓶 盛 裝 。

1. The chirality of an amino acid results from the fact that its α carbon: (A) has no net charge. (B)is a carboxylic acid. (C) is bonded to four different chemical groups. (D)is in the L absolute configuration in naturally occurring proteins. (E)is symmetric.

複選題2. All of the amino acids that are found in proteins, except for proline, contain a(n): (A) amino group. (B)carbonyl group. (C) carboxyl group. (D)ester group. (E)thiol group.

3. The uncommon amino acid selenocysteine has an R group with the structure -CH2-SeH (pKa ≈ 5). In an aqueous solution, pH = 7.0, selenocysteine would: (A) be a fully ionized zwitterion with no net charge. (B)be found in proteins as D-selenocysteine. (C) never be found in a protein. (D)be nonionic. (E)not be optically active.

4. The first step in two-dimensional gel electrophoresis generates a series of protein bands by isoelectric focusing. In a second step, a strip of this gel is turned 90 degrees, placed on another gel containing SDS, and an electric current is again applied. In this second step: (A) proteins with similar isoelectric points become further separated according to their molecular weights. (B)the individual bands become stained so that the isoelectric focus pattern can be visualized. (C) the individual bands become visualized by interacting with protein-specific antibodies in the second gel. (D)the individual bands undergo a second, more intense isoelectric focusing. (E)the proteins in the bands separate more completely because the second electric current is in the opposite polarity to the first current.

5. Which of the following describes the overall three-dimensional folding of a polypeptide? (A) Primary structure (B)Secondary structure (C) Tertiary structure (D)Quaternary structure (E)None of the above

6. In an aqueous solution, protein conformation is determined by two major factors. One is the formation of the maximum number of hydrogen bonds. The other is the: (A) formation of the maximum number of hydrophilic interactions. (B)maximization of ionic interactions. (C) minimization of entropy by the formation of a water solvent shell around the protein. (D)placement of hydrophobic amino acid residues within the interior of the protein. (E)placement of polar amino acid residues around the exterior of the protein.

7. In the α helix the hydrogen bonds: (A) are roughly parallel to the axis of the helix. (B)are roughly perpendicular to the axis of the helix. (C) occur mainly between electronegative atoms of the R groups. (D)occur only between some of the amino acids of the helix. (E)occur only near the amino and carboxyl termini of the helix.

8. The major reason that antiparallel β-stranded protein structures are more stable than parallel β-stranded structures is that the latter: (A) are in a slightly less extended configuration than antiparallel strands. (B)do not have as many disulfide crosslinks between adjacent strands. (C) do not stack in sheets as well as antiparallel strands. (D)have fewer lateral hydrogen bonds than antiparallel strands. (E)have weaker hydrogen bonds laterally between adjacent strands.

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 06：儀器保養維護 1-58（2025/12/23 更新）#135595

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 05：執行一般檢驗 51-111（2025/12/23 更新）#135594

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 05：執行一般檢驗 1-50（2025/12/23 更新）#135593

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 04：水質採樣及處理 1-57（2025/12/23 更新）#135592

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 03：水質檢驗一般基本操作 51-115（2025/12/23 更新）#135591

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 03：水質檢驗一般基本操作 1-50（2025/12/23 更新）#135590

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 02：執行管理作業 1-58（2025/12/23 更新）#135589

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 01：瞭解污染及其影響 51-88（2025/12/23 更新）#135588

114年 - 15704 農田灌溉排水─灌溉水質管理及檢驗項 乙級 工作項目 01：瞭解污染及其影響 1-50（2025/12/23 更新）#135587

114年 - 114-1 全國技術士技能檢定學科_乙級：15704 農田灌溉排水─灌溉水質管理及檢驗項#129675