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.
Between water molecules hydrogen bonds are found which are called as intermolecular hydrogen bonding The water molecule has H-O-H, 2 hydrogen and one oxygen present. The O atom is highly electronegative in comparison to the H atom, hence it attracts the electron pair towards itself, making O atom itself partial negatively charged and H atom partial positively charged. So, water is a polar compound. The partially negative charged O atoms, (forms bond) attracts partially positively charged H atom from other molecule, forming hydrogen bond, and water forms intermolecular hydrogen bonding.