4. How many three-element subsets are three of the five-element set{1, 2, 3, 4, 5}？(10%)

1.在原核及真核生物中蛋白質的生合成，均發生在核醣體(ribosome)上，但是在原核細胞與真核細胞的mRNA，辨識核醣體的起始方式有非常大的差異。請就轉譯起始(initiation of protein synthesis)部份，說明在原核細胞與真核細胞的差異(參考關鍵:Shine-Dalgarno sequence、Cap binding protein)。(20分)