THE POLYMERASE CHAIN REACTION (PCR) OBTECTIVE: To amplify a region of ribosomal DNA from a small amount of genomic DNA. INTRODUCTION: The polymerase chain reaction (PCR) was developed in 1983 by Kary Mullis, a nucleic acids chemist (then at Cetus).HE POLYMERASE CHAIN REACTION (PCR) OBTECTIVE: To amplify a region of ribosomal DNA from a small amount of genomic DNA. INTRODUCTION: The polymerase chain reaction (PCR) was developed in 1983 by Kary Mullis, a nucleic acids chemist (then at Cetus).
The elements on the periodic table are divided in three categories which are metals, non-metals and metalloids. Metals and nonmetals are two categories that are used to classiâ¦fy  the elements in the periodic table. The third is inert gases. 7 people found this useful.
seventeen elements are generally classified as nonmetals most are gases hydrogen helium nitrogen oxygen fluorine neon chlorine argon krypton xenon and radon one is a liquid bromine and a few are solids carbon phosphorus sulfur selenium and iodine