Water is an essential body. In it living organisms exist and live their lives. Its molecular formula is H2O. water which is 70% or more of the weight of most organisms and covering the Earth’s surface consists of an oxygen atom connected to two hydrogen atoms by polar covalent bonds. It is considered to be the universal dissolvent for many reasons because of its structural, chemical and physical data. These properties result in the many unique water’s characteristics.

 

Water as a Reactant

Water is not only a solvent for many biomolecules but also has a really huge role in many reactions with biomolecules within living organisms.

The main example is the conversion of ADP to ATP, which is an essential process for storing energy in living organisms. During this process a condensation reaction reassembles. That happens because of the elimination of water when the reactant ADP couples with a 3rd phosphate group. Water is thus a product in this reaction. When energy is needed, a type of hydrolysis reaction occurs where water is required to hydrate ATP to release the energy. When water becomes a reactant, such as in a hydrolysis reaction, the electron-rich oxygen will serve as a nucleophile.

Hydrolysis reactions tend to be exergonic which means that energy is released. Two molecules are produced from one molecule due to the aid of water. From this process we can see that these types of reactions are favorable since the randomness of the system is increased. Water also tends to an essential component in oxidation reduction reactions that occur in respiration for plants and animals.