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.
R = nuclear radius in metres (m). r 0 = is the radius of a nucleon approx 1.3 fm. A = nucleon number. Nuclear Density. By assuming the nucleus to be a sphere we can calculate the density of the nucleus.e can then work out the closest distance of approach of the alpha particle to the nucleus. loss in kinetic energy E k = gain in potential energy by the field E p. These experiments show the nucleus must be smaller than about 10 -14 m.