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.
Once the two strands are separated a small piece of RNA, called an RNA primer, is attached to the DNA by an enzyme called DNA primase. These primers are the beginnings of all new DNA chains since the enzyme responsible for the copying of the DNA, DNA polymerase, can not start from scratch. It is a self-correcting enzyme and copies the DNA template with remarkable fidelity. The DNA polymerase can only read in the 3' to 5' direction.