Answer :

A molecule of an organic compound contains at least one atom of "(1) carbon". This is referred to as organic chemistry, since all living matter is carbon-based. 

Answer: (1) carbon

Explanation: Organic compounds are those compounds which contains a carbon atom. Nearly all organic compounds contain hydrogen and some of the organic compounds contain oxygen. Example: Glucose([tex]C_6H_{12}O_6[/tex]), Methane ([tex]CH_4[/tex])

Inorganic compounds are those compounds which do not contain a carbon atom. Example : [tex]NaCl[/tex]