18. Single-copy replication control means that: (A) there can be only one origin of replication in the entire genome. (B) only one DNA molecule can be present in a cell at a time. (C) only one DNA molecule can be replicated in a cell at a time. (D) there can be only one origin of replication on each DNA molecule. (E) a DNA molecule can only be replicated once during the cell cycle.

18. Single-copy replication control means that:
(A) there can be only one origin of replication in the entire genome.
(B) only one DNA molecule can be present in a cell at a time.
(C) only one DNA molecule can be replicated in a cell at a time.
(D) there can be only one origin of replication on each DNA molecule.
(E) a DNA molecule can only be replicated once during the cell cycle.

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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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