Recombinant DNA Technology
A plasmid

usually contains one or more restriction sites
All of these
is a circular DNA molecule
always contains an origin of replication

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Recombinant DNA Technology
Which of the following is correct in terms of determination of location of genetic traits?

Restriction sites allow DNAs to be digested
Protein-coding genes are always associated with a restriction pattern
Known protein coding sequences are too far apart to allow linkage determination for most new genes
None of these

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Recombinant DNA Technology
An expression vector

usually contains a gene that confers antibiotic resistance to the bacterial host
always contains DNA segments for the regulation of mRNA production
always contains an origin of replication
All of these

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