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.
1 Uranus is the smallest of the four âgiantsâ, but is still several times larger than the Earth. 2  It has a diameter of 29297 miles, or 47, 150 kilometres, compared to the Earthâs diameter of just under 8000 miles, or 12,760 kilometres. 3  Uranus is 1782 million miles, or 2869 million kilometres from the Sun.