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.
Distances less than a parsec. Distances measured in fractions of a parsec usually involve objects within a single star system. So, for example: One astronomical unit (AU), the distance from the Sun to the Earth, is 4.85Ã10â6 pc.