All living things have in common their genetic building blocks, which are DNA. Though each organism's DNA differs in what specific genes they carry, which account for the diversity of life, all known living things use th... More »

All living things have at least one cell. Cells are the basic building blocks of life. Unicellular organisms consist of one cell, and multicellular organisms contain more than one cell. More »

All living things require a source of energy, nutrients, water, space to grow and reproduce, and a relatively stable environment that allows homeostasis. Many organisms also require oxygen, but this is not a universal re... More »

Living and nonliving things bear commonalities in that they are both comprised of matter, obey physical laws and tend toward states of minimum energy. Living things are different in that they can repair damage, grow and ... More »

Amino acids are organic compounds that are the building blocks from which proteins are made. They are common to all living things, but they are not a part of lipids or carbohydrates, and they are not found in inorganic m... More »

The basic building blocks of protein are amino acids, organic compounds that contain the chemical subunits known as an amino group and a carboxyl group. To form proteins, amino acids bond to one another with a special ch... More »

Free-form amino acids do not contain peptide bonds as they are the monomer building blocks of proteins. As explained by Dr. John W. Kimball, peptide bonds form between two amino acids, creating long polypeptide chains. P... More »