Recombinant DNA is DNA that
- A. has been copied many times in a test tube
- B. has been joined together from two different sources
- C. has lost one of its two strands
- D. has been broken down into nucleotides
Explanation
A gene cut from one organism is inserted into the DNA of another, usually a bacterial plasmid, so the molecule carries sequences that never occurred together in nature. Because the genetic code is universal, the host reads the foreign gene and makes the protein it codes for. Copying DNA repeatedly in a tube is the polymerase chain reaction, a different technique altogether.
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