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www.reference.com/article/forward-reverse-primers-dec9d6569860ce48

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.

www.reference.com/article/apply-primer-35a62b2bc1dea12

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.

www.reference.com/article/primer-internet-works-6490a7f67768cd25

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.

www.reference.com/article/makeup-primer-8e844fdde3a21510

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...

www.reference.com/article/long-primer-dry-51e9be5a82633b84

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...

www.reference.com/article/reversible-change-e58a07f09a84c144

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.

www.reference.com/article/primer-bulb-work-53f1414ea98443be

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 ...