2. Genetic engineering is the artificial manipulation, modification, recombination of what class of naturally occurring chemical compound? A. amino acids B. nucleic acids C. phosphates D. proteins 3. In the modern era, the term genetic engineering refers specifically to which of the following methods? A. artificial selection C. genetic variation B. in vitro fertilization D. recombinant DNA technology 4. In recombinant DNA technology, what molecule is the most commonly used DNA vector (or carrier, used to insert foreign genetic material into an organism's genome)? A. cell B. clone D. plasmid C. gene 5. What type of organism was the first to be successfully modified via the techniques of genetic engineering? A. bacteria B. mouse C. plant D. virus 6. Which of the following is the primary method of genetic engineering that has been studied in humans? A. cloning C. gene therapy