AN ORGANELLE FOUND IN LARGE NUMBERS IN MOST CELLS, IN WHICH THE BIOCHEMICAL PROCESSES OF RESPIRATION AND ENERGY PRODUCTION OCCUR. IT HAS A DOUBLE MEMBRANE, THE INNER LAYER BEING FOLDED INWARD TO FORM LAYERS
A MINUTE PARTICLE CONSISTING OF RNA AND ASSOCIATED PROTEINS, FOUND IN LARGE NUMBERS IN THE CYTOPLASM OF LIVING CELLS. THEY BIND MESSENGER RNA AND TRANSFER RNA TO SYNTHESIZE POLYPEPTIDES AND PROTEINS.