RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Internal cellular structure. Illustration of internal cellular structures (organelles), including a mitochondrion (red, lower left), the cell nucleus (purple, top right), and ribosomes (red spheres) on endoplasmic reticulum (membranous surfaces). Nuclear pores are shown on the surface of the cell nucleus. The cell nucleus contains the cellular DNA (deoxyribonucleic acid). Ribosomes are the site of protein synthesis. Mitochondria are where energy is generated and stored.
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