Final answer:
Injecting DNA into cells can be done through microinjection with a glass micropipette or using a gene gun with compressed air and gold beads. These techniques are integral to biotechnology and the creation of GMOs.
Step-by-step explanation:
Injecting DNA into cells can be accomplished using A) micropipettes, or compressed air and gold beads. This technique is referred to as microinjection, where a microinjection needle or a glass micropipette is used to directly penetrate the cell membrane and nuclear envelope to introduce recombinant DNA into eukaryotic cells.
Another prevalent method is using a gene gun that shoots gold or tungsten particles coated with DNA into plant protoplasts. These methods are crucial in the field of biotechnology, enabling the creation of genetically modified organisms through the introduction of foreign DNA.