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Primers are small DNA sequences that are designed to start DNA replication in a laboratory technique called polymerase chain reaction, or PCR, to amplify certain segments of DNA. Forward and reverse primers differ in the direction in which they initiate the replication.


To apply paint primer, use a roller to paint 3-foot-square sections with V-shaped or W-shaped strokes. Use a primer that is tinted to a shade similar to the top coat to reduce the number of coats necessary to cover a wall.


The Internet is a huge network of computers that send messages and other data to each other. For the most part, it works using the same underlying infrastructure used for telephone voice calling.


Makeup primer is a product applied to the skin prior to other types of cosmetics to give better and longer-lasting coverage. Various types of primers, such as foundation primers, lip primers, eyelid primers and even mascara primers, target different areas of the face, b...


The time it takes for primer to dry varies with different manufacturers, temperatures and humidity levels. Types of primers include oil based, latex, enamel and all purpose. Some are a combination of paint and primer. Latex primers typically take between 30 minutes to o...


A reversible change is a physical change that can be undone. A final substance can be converted back to the original substance without creating any new material. Freezing, melting, dissolving, boiling, evaporating and condensing are reversible changes.


Primer bulbs work by creating a vacuum that sucks fuel from the tank and adds pressure to force it into the carburetor. Many small engines use a primer bulb to make starting easier. Owners should follow the manufacturer's directions for the number of times to press the ...