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.
Smallest Mountain. It is not easy to determine the smallest mountain in the world. The difficulty lies in the fact that there is no universal agreement as to when a landform stops being a hill and into a mountain. Some researchers say 600 m (1980 ft) is the minimum acceptable height for a mountain.