Recombinant DNA is DNA that
Correct answer: B. has been joined together from two different sources
- 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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Biotechnology applies genetic engineering, cell culture and recombinant DNA methods to medicine and public health. The material includes production of insulin, vaccines and antibiotics, diagnostic techniques, gene therapy, genetically modified organisms and the ethical concerns surrounding manipulation of human genes.
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