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.
Thus, water molecules are actually attracted to each other and form hydrogen bonds. Water Molecule Water Molecule Hydrogen bonds are very important to living things as these bonds allow the strands of DNA to hold together, proteins to form and water to behave as it does.