39. Following the above description, if you first use Sephadex G-100 gel filtration column to do the purification, what is the elution order for the four proteins (＞, begin with the faster one； =, equal)? (A) 3 = 4 ＞ 1 = 2 (B) 2 = 3 ＞ 1 = 4 (C) 2 = 4 ＞ 1 = 3 (D) 1 = 4 ＞ 2 = 3 (E) 1 = 2 ＞ 3 = 4

39. Following the above description, if you first use Sephadex G-100 gel filtration column to do the purification, what is the elution order for the four proteins (＞, begin with the faster one； =, equal)?
(A) 3 = 4 ＞ 1 = 2
(B) 2 = 3 ＞ 1 = 4
(C) 2 = 4 ＞ 1 = 3
(D) 1 = 4 ＞ 2 = 3
(E) 1 = 2 ＞ 3 = 4

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複選題5. Which of the following statements about transposon are correct? (A) Transposon is a DNA sequence that can irreversibly change its position within a genome. (B) Transposition often results in duplication of the same genetic material. (C) The reverse transcription step of retrotransposon is catalyzed by a reverse transcriptase, which is often encoded by the transposon itself. (D) Dissociation elements (Ds) is an example of an autonomous transposon, and activator element (Ac) is an example of a non-autonomous transposon. Without Ds, Ac is not able to transpose. (E) Transposition of Ds was sometimes accompanied by major chromosomal rearrangements including deletions, duplications, inversions, reciprocal translocations.

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