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.
NASA/JPL-Caltech/UCB. Astronomers recently stumbled upon a teeny star called 2MASS J0523-1403 located just 40 light years away. It's not only the smallest star discovered so far - it may also represent the smallest possible star.