40. Non-coding RNAs (ncRNAs) do not code for proteins. Column I lists ncRNAs. Match each one in column I to its correct description in Column II.

Column I
small cytoplasmic RNAs (scRNA)
small nuclear RNA (snRNA)
small nucleolar RNA (snoRNA)

Column II
A. RNAs that are present in the cytoplasm.
B. One of many small RNA species confined to the nucleus； several of them are involved in splicing or other RNA processing reactions.
C. A small nuclear RNA that is localized in the nucleolus.

(2)Please explain the mechanism of "ribosomal frameshifting" for the translation of viral products of SARS-CoV-2.

(1)Please explain "polycistronic RNA"?

25. 四行程柴油引擎進氣門開啟，排汽門關閉，活塞自上死點下行， 將純空氣吸入汽缸內，此為 (A)壓縮行程 (B)動力行程 (C)進氣行程 (D)排氣行程。

24. 下列何者不是活塞應具備的特性 (A)強度大、耐磨 (B)需能耐高 溫與高壓 (C)膨脹係數大 (D)質輕且導熱性佳。

23. 車子轉彎時內前輪之轉向角度與外前輪轉向角度之差稱為 (A) 內傾角 (B)外傾角 (C)前束 (D)轉向前展。