. Biophysical science. Biophysics. Nucleus. (b) Figure I. (a) Three Chlorella cells. This diagram emphasizes that the single cup-shaped chloroplast occupies most of the cell. The pyrenoid is associated with starch and/or protein synthesis and/or storage, (b) A corn chloroplast. Sketch of an electron micrograph of a chloroplast from Zea mais. The dark regions are the grana. They are cylinders about 4,000 to 6,000 A in diameter and 5,000 to 8,000 A in height. After E. I. Rabinowitch, Photosynthesis, II, 2 (New York: Interscience Publishers, Inc., 1956), from Vatter, unpublished, modified. and mo
. Biophysical science. Biophysics. Nucleus. (b) Figure I. (a) Three Chlorella cells. This diagram emphasizes that the single cup-shaped chloroplast occupies most of the cell. The pyrenoid is associated with starch and/or protein synthesis and/or storage, (b) A corn chloroplast. Sketch of an electron micrograph of a chloroplast from Zea mais. The dark regions are the grana. They are cylinders about 4,000 to 6,000 A in diameter and 5,000 to 8,000 A in height. After E. I. Rabinowitch, Photosynthesis, II, 2 (New York: Interscience Publishers, Inc., 1956), from Vatter, unpublished, modified. and most higher plants, all of which have many chloroplasts per cell. The chloroplasts of higher plants are shaped like a saucer with a diameter of 4 to 6 fx and a thickness of to (jl. In nongreen plants, the pigmented organelles responsible for photosynthesis are called by other names such as chromoplasts. A more general term used for both chloro- plasts and chromoplasts is plastid. The algal cells have one to 50 plastids per cell. When these plastids first form they are homogeneous, but as they develop, structure appears. They are filled with smaller dark bodies called grana, which contain all the photosynthetic pigment. A simplified cross section of a corn plastid. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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