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.
Causes. Eczema has a genetic basis and tends to run in families. Itâs also often associated with other allergy-type conditions such as asthma or hay fever. In some children, diet seems to play a role in eczema, although itâs often hard to pinpoint the food that causes the problem.Eczema might flare up:1  after contact with irritating chemicals, such as soaps or bubble baths, or other things like woollen or polyester garments.n some children, diet seems to play a role in eczema, although itâs often hard to pinpoint the food that causes the problem. Eczema might flare up: 1  after contact with irritating chemicals, such as soaps or bubble baths, or other things like woollen or polyester garments.