The modern working definition of a gene is a portion (or sequence) of DNA that codes for a known cellular function or process (e.g. the function make melanin molecules). A single 'gene' is most similar to a single 'word' in the English language.
Polar covalent bonds hold the actual hydrogen and oxygen atoms within the molecule of water but if you meant what holds water together as a liquid then that is called hydrogenâ¦ bonding between molecules, a type of dipole interaction.
One loses a hydrogen and oxygen from its carboxyl group (COOH) and the other loses a hydrogen from its amino group (NH 2). This reaction produces a molecule of water (H 2 O) and two amino acids joined by a peptide bond (-CO-NH-).The two joined amino acids are called a dipeptide. peptide bond can be broken by hydrolysis (the adding of water). In the presence of water they will break down and release 8â16 kilojoule / mol (2â4 kcal / mol) of free energy. This process is extremely slow. In living organisms, the process is catalyzed by enzymes.