17. Minicells result from mutations that: (A) prevent growth of the cell. (B) prevent septum formation. (C) prevent DNA replication. (D) prevent chromosome partitioning. (E) cause septa to be formed in the wrong place or to be formed too frequently.

17. Minicells result from mutations that:
(A) prevent growth of the cell.
(B) prevent septum formation.
(C) prevent DNA replication.
(D) prevent chromosome partitioning.
(E) cause septa to be formed in the wrong place or to be formed too frequently.

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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.

17. Minicells result from mutations that:
(A) prevent growth of the cell.
(B) prevent septum formation.
(C) prevent DNA replication.
(D) prevent chromosome partitioning.
(E) cause septa to be formed in the wrong place or to be formed too frequently.

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