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 largest unit of distance that I'm aware of is the gigaparsec (Gpc) or 1 billion parsecs. Astronomers use a method called parallax to measure the distance to some stars, and an object with a <b>par</b>allax of one <b>sec</b>ond is said to be 1 parsec away. This distance is 3.09x1016 meters, so a gigaparsec is 3.09x1025 meters.