Deoxyribonucleic acid or DNA is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell, and are passed down from parents to their children.ach nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code.
Hello, Dryness of scalp can be due to hormonal imbalance, poor health, poor hygiene, allergic hypersensitivity, lack of rest, emotional stress, excessive consumption of sugar, fat or starch, heredity predisposition and medical causes like eczema, atopic dermatitis or seborrheic dermatitis.
1 Eczema is a skin condition that causes itchy, red, and swollen patches of skin. 2  The most common type is called atopic dermatitis. 3  Everyday things in your environment â cigarette smoke, pollen, and even your clothes â can cause eczema to flare.hen the mercury plunges, it could cause eczema symptoms to spike. In many people, extreme cold can cause eczema breakouts because skin becomes too dry. Moisturizers are an important eczema treatment, especially in cold weather. They help keep skin from drying out, cracking, and itching.