لخّصلي

The biological role of nitrogen and phosphorus cannot be overestimated.Phosphorus (in the form of remains of orthophosphoric acid) is the component of DNA, RNA and nucleotide mono-, di, tri and cyclophosphates.Nitrogen is the part of DNA, RNA, proteins and many bioactive molecules.Proteins can undergo posttranslational phosphorylation (and then dephosphorylation).

The biological role of nitrogen and phosphorus cannot be overestimated. Nitrogen is the part of DNA, RNA, proteins and many bioactive molecules. Phosphorus (in the form of remains of orthophosphoric acid) is the component of DNA, RNA and nucleotide mono-, di, tri and cyclophosphates. Proteins can undergo posttranslational phosphorylation (and then dephosphorylation). These actions can "switch on" or "switch off" the enzyme. Phosphorylation can be described as the formation of ester between phosphoric acid and hydroxyl group of serine, threonine or tyrosine.

Fluorine is known as a necessary element for tooth tissue. Chloride anions are the most common anions both inside and outside the cells. Iodine is accumulated in thyroid gland where it becomes a building block of such hormone as triiodothyronine (T₂) that is produced from thyroxine (T4). Bromine has no definite function in the organism, while it is known to demonstrate sedative effects. Noble gases are used as narcoleptic agents in anesthesiology because they can bind different receptors in the nervous system. Radon is used in radiation therapy.