It would be nucleic acids. These are found in the cells of our body and examples are RNA(ribonucleic acid) and DNA(deoxyribonucleic acid). These acids are important because they help with maintanence, reproduction, repair and metabolism within the cells. DNA contains the blueprint of the organisms in a double helix molecule. Its subunits are called nucleotides and they in turn, consist of a sugar called deoxyribose, a phosphate group and one of four nitrogenous bases--adenine, guanine, thymine or cytosine. RNA is a single- stranded molecule able to transfer the genetic message in the DNA to a ribosome to manufacture proteins needed for growth and repair and maintenance within cells. Several types of RNA exist including--messenger RNA which transcribes and carries the DNA message to a ribosome. Ribosomal RNA is a part of the ribosome and aids with peptide bond formation between amino acids. Transfer RNA is a carrier molecule bringing the proper amino acid to the ribosome, as per the messenger RNA transcript. It is involved in the process of translation which results in the formation of a protein. These are the most prevalent acids in the human body.
nucleic acid another information i want to give you it is also present due to which when it bites us some swalling produced.