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.
Estimating distance by using only your finger is based on this known fact about human anatomy: Your arm is about ten times longer than the distance between your eyes. The distance between your eyes is about 2â apart and the distance from your eye to your extended finger is about 20â apart.