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.
This is known as cohesion. Similarly, water molecules can also form hydrogen bonds with other polar molecules, and this is known as adhesion. Together, cohesion and adhesion explain capillary action, which is the ability of water to rise against the forces of gravity in a small tube. To unlock this lesson you must be a Study.com Member.