3. COVID-19 vaccines help our bodies develop immunity to the virus. Please describe how mRNA COVID-19 vaccines work
2. Two polypeptides, A and B, have similar tertiary structures, but A normally exists as a monomer, whereas B exists as a tetramer. What differences might be expected in the amino acid composition of A versus B?
二、簡答題
1. What is epigenetic regulation? Discuss how environmental factors may affect epigenetic regulation in humans.
50. 下列哪一種配位化合物(coordination compound)與硝酸銀水溶液 進行反應時,最容易形成氯化銀
沉澱? (A) Na3CrCl6 (B) Cr(NH3)3Cl3 (C) Na2Cr(C2O4)2Cl2 (D) Cr(NH3)6Cl3
49. 將氨水緩慢滴加至含有 的水溶液中,一開始觀察到沉澱物產生,最可能是下列哪個選 項的化合物? (A) CuO (B) Cu2O (C) Cu(OH)2 (D) [Cu(NH3)4]2+
48. 一溶液中含有 的
和
M 的
,兩種離子互相不影響,慢慢加入碘化鈉至溶液中,請問混合溶液中的碘離子
濃度至少要達到多少,才開始形成
沉澱? (溶解度積常數
(PbI2) = 1.4 × 10−8 ;
(CuI) = 5.3 ×
) (A)
= 5.3 ×
M (B)
= 3.9 ×
M (C)
= 2.6 ×
M (D)
= 1.3 ×
M
This is a large modal.