Under pharmacist supervision, pharmacy technicians: 1  supply medicines to patients, whether on prescription or over the counter. 2  assemble medicines for prescriptions.
A primer is a short nucleic acid sequence that provides a starting point for DNA synthesis. In living organisms, primers are short strands of RNA. A primer must be synthesized by an enzyme called primase, which is a type of RNA polymerase, before DNA replication can occur.
Polymerase chain reaction (PCR) is a method that allows exponential amplification of short DNA sequences. (usually 100 to 600 bases) within a longer double stranded DNA molecule. PCR entails the use of a pair of. primers, each about 20 nucleotides in length, that are complementary to a defined sequence on each of the. two strands of the DNA. These primers are extended by a DNA polymerase so that a copy is made of the.