A plasmid is
Correct answer: D. a small circular DNA molecule that replicates independently in bacteria
- A. part of the main bacterial chromosome
- B. a viral protein coat
- C. a type of ribosome
- D. a small circular DNA molecule that replicates independently in bacteria
Explanation
Plasmids carry extra genes such as antibiotic resistance and replicate separately from the chromosome. Their small size and independence make them the standard vectors of genetic engineering.
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About Biotechnology and Health Care
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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