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.
The name of the smallest bone is the stapes, also known as the stirrup. It is found in the middle ear where it transmits sound vibrations from the Incas (anvil), which is the second smallest bone in the human body, to the inner ear. It is only about 2.5-3.5 mm (a 10th of an inch) big.