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.
Cool Facts. 1  The Least Sandpiper is the smallest shorebird in the world, weighing in at about 1 ounce and measuring 5-6 inches long. 2  Eastern populations probably fly nonstop over the ocean from the Gulf of St. Lawrence and New England to wintering grounds in northeastern South America, a distance of about 1,800 to 2,500 miles.