PROFESSOR ANNE SMITH / SCIENCE PHOTO LIBRARY PROFESSOR ANNE SMITH / SCIENCE PHOTO LIBRARY
Transmission electron micrograph of a single cell green algae Dunaliella tertiolecta, showing its internal structure. Dunaliella is a biflagellate organism. The two flagellae, used in locomotion, is a branched projection at top. The large oval is the cell nucleus with the nucleolus appearing as a black spot. The black lines around the edges of the algae are chloroplasts. Unlike plants, algal chloroplasts are not bound into discrete units by a membraneWhite regions in the chloroplasts are starch grains, a product of photosynthesis. The toothlike body is a pyrenoid, associated with starch production. Magnification: x3525 at 35mm size.
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