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The Biological Importance of Water Water molecules consist of an oxygen atom covalently bonded to two hydrogen atoms, forming bond angles of around 105o. The oxygen atom is more electronegative than the hydrogen atoms, so electrons are distributed more towards the oxygen making the water molecule polar. Because it has a high electron density, the oxygen atom can attract atoms which are electron deficient (?+). The electron deficient atom forms a Hydrogen bond with the electron rich oxygen atom (?-). These Hydrogen bonds are seen in between water molecules as well as in other important compounds. Although Hydrogen bonds are fairly weak, collectively they can stabilise a compound and it is due to hydrogen bonding that water remains in a liquid state between 0oC to 100oC. This is important because water is only biologically useful in its liquid state, so that it can be used by living organisms. When other compounds such...

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