Flexi Says: In addition to having a plasma membrane, cytoplasm, a nucleus and ribosomes, eukaryotic cells also contain membrane-bound organelles. Each organelle in a eukaryote has a distinct function. Because of their complex level of organization, eukaryotic cells can carry out many more functions than prokaryotic cells. For example, muscle cells have abundant mitochondria to produce energy needed for muscle tissue contraction. Red blood cells produce the oxygen-binding protein hemoglobin, which the cells use to deliver oxygen to tissues throughout the body.
