Which Statement Regarding Plasmid-Cloning Vectors Is CORRECT

question 35

Multiple Choice

Which statement regarding plasmid-cloning vectors is CORRECT?

• A) Circular plasmids do not require an origin of replication to be propagated in E. coli.
• B) Foreign DNA fragments up to 45,000 base pairs can be cloned in a typical plasmid.
• C) Plasmids do not need to contain genes that confer resistance to antibiotics.
• D) Plasmid vectors must carry promoters for inserted gene fragments.
• E) The copy number of plasmids may vary from a few to several hundred.

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