...20 but these don't seem to make sense.? Some proteins are destined to stay in the cell others are destined to leave the cell (secretion). Are these two types of proteins produced in free ribosomes? Explain. ER, Golgi body and other membrane bound organelles often work together to produce a finished functional product. What structure connects them? The product of many organelles often requires careful transport to another organelle for further processing. What structure directs the transport of a product from one organelle to the correct next organelle? Cellular respiration occurs in a stepwise fashion in order to efficiently produce ATP (not a lot of loss of heat loss occurs). What structures and features of these structures contained in the cytoplasm and the mitochondrion allow this step-driven mechanism?