After collecting samples of the material found growing on last month's leftovers at the back of your fridge, you realize that you have discovered a new type of organism. you find that the cells have distinct subunits within. further, several of these subunits, which you have nicknamed groucho, chico, and harpo, seem to be involved in the production and transfer of certain molecules. molecule dumont, as you call it, appears after a messenger molecule is sent from groucho to chico. dumont then travels to harpo, where it is covered in membrane and (eventually) released from the cell.
dumont is most likely what type of molecule?

Protein

Explanation: Molecule Dumont is a protein molecule, with Groucho being a DNA molecule, Chico being the ribosome, and Harpo being the Golgi apparatus.

Groucho (DNA) contains the information needed for the protein to be produced, and sends this information to Chico(ribosome) with a messenger molecule(mRNA). At Chico, the information is processed and the Dumont is synthesized with various of its subunits, called amino acids. Once done, Dumont moves over to Harpo (Golgi apparatus), where it is basically 'packaged', meaning it is modified for either staying in the cell, being sent to fuse with the membrane, or covered in it's own membrane and sent out of the cell.