Ribosomes perform similar functions as a steering wheel in their respective systems!
Ribosomes are sites of protein synthesis. Proteins are needed to carry out cell activites and as energy outside the cell. Likewise, the steering wheel is the control between the driver and the car. Its where energy is "synthesized".
However, some ribosomes are attached to the Rough Endorplasmic Reticulum (usually for synthesis of protein to be transported out of the cell) whilst some lie freely in the cytoplasm (usually make proteins for use within the cell) There is only one steering wheel to enable the driver to drive and move the car.
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