UNIT 1- BIOLOGICAL MOLECULES

What do all biological molecules contain?

carbo, oxygen and hydrogen

What do some biological molecules contain?

Nitrogen, phosphorous

Atom

the smallest part of an element that cannot be broken down further by chemical means

molecules

two or more are joined together with chemical bonds

element

general name given to a chemical substage made up of only 1 type of atom

compound

a substance made up of many molecules of the same type

organic

molecules that are found in living organisms and always contain carbon, hydrogen and oxygen

inorganic

molecules exist outside living organisms and provide the minerals required for healthy growth of living organisms, for example nitrates

polarity

when there is an uneven distribution of charge on a molecule

polarity in water

hydrogen atoms have a slightly positive charge, while oxygen atoms have a slightly negative charge, which allows two water molecules to be attracted to each other.

properties of water

• polarity

• formation of hydrogen bonds

• surface tension

• solvent

• thermal

• metabolite/reactant

• transparency

• formation of ice