very long and large organic molecules called

Macromolecules.

Explanation:

Molecules may be defined as the substance that are made up of the same or different molecules. Two main type of molecules on the basis of their structure and weight are macromolecules.

Macromolecules are made of the large number of subunits. They have large molecular weight and formed generally by the process of polymerisation. Organic macromolecules are carbohydrates, proteins and nucleic acid. Large number of atoms are involve in the formation of macromolecule.

Thus, the answer is macromolecules.

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