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 Mercury is the closest planet to the Sun, just 58 million km (36 million miles) or 0.39 AU out, but it is not the hottest planet. 2  Mercury is the smallest planet in our Solar System, and is just slightly larger than the Earthâs moon, and equivalent in size to 0.38 Earths.ars. 1  Distance from Sun: Mars is the fourth planet from the sun at a distance of about 228 million km (142 million miles) or 1.52 AU. 2  Diameter: 6,787 km, (4,217 miles). 3  Length of Year (Orbit): 687 Earth days. 4  Length of day: 24 hours 37 minutes.