1. Cytoplasm: This is the fluid-filled space within the cell where many of the cell's metabolic processes occur. Ribosomes found in the cytoplasm are responsible for synthesizing proteins that will be used within the cell itself.

2. Rough Endoplasmic Reticulum (RER): The RER is a network of interconnected membranes within the cytoplasm. Ribosomes attached to the RER produce proteins that will be secreted from the cell or incorporated into cell membranes.

So, in summary:

* Free ribosomes: Found in the cytoplasm, produce proteins for use within the cell.

* Bound ribosomes: Attached to the RER, produce proteins for secretion or membrane incorporation.