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.
Only about 48 miles long and 37 miles wide, Rhode Island is the smallest state in area, though more than 400 meandering miles of shore and inlets line The Ocean Stateâs coast. Browse Photos of the 50 States.