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.
This distance, which for the idealized case is 2.44 Saturn radii (147,000 km [91,300 miles]), represents the closest distance to which a fairly large moon can approach the centre of its more-massive planetary parent before it is torn apart by tidal forces.