The base of each cloud is flat and the top of each cloud has rounded towers. When the top of the cumulus clouds resemble the head of a cauliflower, it is called cumulus congestus or towering cumulus. These clouds grow upward and they can develop into giant cumulonimbus clouds, which are thunderstorm clouds.
Peptide Bond. Covalent bond between the nitrogen of the amino group of one amino acid and the carbon of the carboxyl group of a second amino acid, joining the 2 amino acids together in a peptide or protein.
A gaseous element (atomic number 7; atomic weight 14.01) that is present in biological systems either as the molecular form, N2, or bound to other elements, such as oxygen (i.e., nitric oxide, a neurotransmitter). Nitrogen is critical to all biological systems and is present in proteins and DNA.