Organelles in cells were originally often independent cells, which were incorporated by host cells and lost their ...

This releases the energy that living cells need. In most cells, respiration takes place in tiny organelles called mitochondria, which are found in the cytoplasm. These organelles are sometimes ...

Mitochondria Organelles that contain the enzymes for respiration, and where most energy is released in respiration. Ribosomes Tiny organelles where protein synthesis occurs. Cytoplasm Function A ...