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.
The lips may become chapped and dry due to various factors. 1  Most cases of chapped lips are due to the following: 2  Exposure to harsh winds. 3  Sunburn. 4  Dehydration. 5  Smoking. 6  Exposure to harsh chemicals contained in soaps and other skin care products. 7  Intake of certain strong medications such as those which help to treat acne.