Final answer:
The mismatch regarding ribosomes and protein synthesis is 'd. hemoglobin-attached', as hemoglobin is synthesized by free ribosomes, not attached ones.
Step-by-step explanation:
The mismatched pair regarding free versus attached ribosomes and the proteins they synthesize is d. hemoglobin-attached. This is because hemoglobin is synthesized on free ribosomes in the cytoplasm, not attached ribosomes. Free ribosomes typically synthesize proteins that function within the cytosol, such as many enzymes and cytoskeletal proteins.
In contrast, attached ribosomes, which are bound to the rough endoplasmic reticulum (RER), synthesize proteins destined for either insertion into cellular membranes, export outside of the cell, or for use within lysosomes and other organelles. Integral proteins, for example, are synthesized on attached ribosomes as they are destined to be embedded into the cell membrane. Enzymes can be produced by both free and attached ribosomes, depending on where they are meant to function. Antibodies can also be synthesized by attached ribosomes since they are secreted by cells.