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.
Depends on what you mean by seeing. The particle horizon is just the furthest. distance light could have traveled to us since the universe began. That is 93 billion. light years in diameter, or 47 billion light years in any direction, but we can't actually. see anything at that distance.