Which is an Example of a Recombinant DNA Molecule

Question

Which is an example of a recombinant DNA molecule?
A)a single-stranded RNA hybridized to a single-stranded DNA
B)a genomic fragment of human DNA ligated into a bacterial plasmid vector
C)a bacteriophage chromosome in a bacterial cell
D)a bacterial plasmid cut with a restriction enzyme and then resealed using ligase

Accepted Answer

Recombinant DNA molecules are created by joining DNA fragments from two different sources. In choice B, a genomic fragment of human DNA ligated into a bacterial plasmid vector is a classic example of recombinant DNA, where DNA from a human is inserted into a plasmid (a small, circular piece of DNA found in bacteria) to be replicated or expressed in bacterial cells.