STEVE GSCHMEISSNER / CAROL UPTON / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / CAROL UPTON / SCIENCE PHOTO LIBRARY
Cell organelles. Coloured transmission electron micrograph (TEM) of several organelles in an animal cell. At centre, the nucleus (dark purple, round) contains the cell's genetic material (DNA, deoxyribonucleic acid). Surrounding the nucleus are strands of endoplasmic reticulum (ER, pink), a membrane bound organelle that is the site of lipid synthesis and the production of membrane-bound proteins. Also present are mitochondria (green), which produce the cell's energy.
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