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.
Well, the moon is not always the same distance away from Earth. The orbit is not a perfect circle. When the moon is the farthest away, itâs 252,088 miles away. Thatâs almost 32 Earths. When it's closest, the moon is 225,623 miles away. Thatâs between 28 and 29 Earths. So far apart!