Polymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.olymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.
The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.
the oil immersion lens has the smallest working distance and one runs the risk of striking the slide with the lens when trying to achieve focus. starting with the low power lens, which has a larger working distance, and progressing up to the oil lens is advised.