20. By definition of a Lewis acid, choose the correct answer. 1. 2. 3. 4. NH35. (A) 1 and 3 are Lewis acids. (D) 1 and 4 are Lewis acids. (B) 2 and 4 are Lewis acids. (E) 2 and 3 are Lewis acids. (C) 5 is Lewis acid.

20. By definition of a Lewis acid, choose the correct answer.

1. 2. 3. 4. NH₃5.
(A) 1 and 3 are Lewis acids.
(D) 1 and 4 are Lewis acids.
(B) 2 and 4 are Lewis acids.
(E) 2 and 3 are Lewis acids.
(C) 5 is Lewis acid.

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題目解析 Lewis 酸的定義是指能夠...

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第26至50題每題2.5分 26. Sam is trying to separate a protein mixture containing three proteins A, B, C. Protein A: homotetramer, Mr = 120,000, pI =6； Protein B: monomer, Mr = 80,000, pI=7； Protein C: monomer, Mr = 13,000, pI=9. Please choose the correct one from the following descriptions: (A) If Sam dissolves the mixture in 0.1 M Tris-HCl (pH 7) and uses SDS-PAGE to separate the mixture, the protein bands in the gel from top to bottom should be B-A-C. (B) If Sam dissolves the protein mixture in 20 mM phosphate buffer (pH 8) and loads it to an anion exchange column equilibrated with the same buffer, only protein C can bind to the column. (C) If Sam dissolves the mixture in 0.1 M Tris-HCl (pH 7) and uses size exclusion column to separate the mixture, protein C will be first eluted. (D) If Sam dissolves the mixture in 0.1 M Tris-HCl (pH 7) and uses size exclusion column to separate the mixture, the elution sequence is B-A-C. (E) If Sam dissolves the protein mixture in 20 mM phosphate buffer (pH 7) and loads it to a cation exchange column equilibrated with the same buffer, only protein A can bind to the column.

20. By definition of a Lewis acid, choose the correct answer.

1. 2. 3. 4. NH₃5.
(A) 1 and 3 are Lewis acids.
(D) 1 and 4 are Lewis acids.
(B) 2 and 4 are Lewis acids.
(E) 2 and 3 are Lewis acids.
(C) 5 is Lewis acid.

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20. By definition of a Lewis acid, choose the correct answer. 1. 2. 3. 4. NH35. (A) 1 and 3 are Lewis acids.(D) 1 and 4 are Lewis acids.(B) 2 and 4 are Lewis acids.(E) 2 and 3 are Lewis acids.(C) 5 is Lewis acid.

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20. By definition of a Lewis acid, choose the correct answer.

1. 2. 3. 4. NH₃5.
(A) 1 and 3 are Lewis acids.
(D) 1 and 4 are Lewis acids.
(B) 2 and 4 are Lewis acids.
(E) 2 and 3 are Lewis acids.
(C) 5 is Lewis acid.