DNA. complementary DNA (cDNA), copy DNA DNA transcribed from a specific RNA through the action of the enzyme reverse transcriptase. mitochondrial DNA (mtDNA) the DNA of the mitochondrial chromosome, existing in several thousand copies per cell and inherited exclusively from the mother.
Castor Oil. Castor oil is another good treatment for dry and chapped lips. Simply apply castor oil to your lips several times a day. You can also make a soothing treatment using one teaspoon of castor oil, one teaspoon of glycerin and a few drops of fresh lemon juice.
When outdoors, protect your lips with a cream or balm containing sunscreen. Photo Credit Jupiterimages/Comstock/Getty Images. Chapped lips are unsightly and painful, particularly if the skin peels and cracks. Peeling skin on the lips can make them so tender that eating and drinking become uncomfortable. If chapped lips become badly enough inflamed, they can bleed and are likely to become infected.