Vacuoles - chloroplasts. The photograph below is an Elodea...

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Vacuoles Vacuoles are membranous sacs similar to, but larger than vesicles . Vacuoles store water and dissolved substances. They are more important in plant cells. Most of the center of a plant cell is occupied by a central vacuole. The central vacuole gives support because pressure within the vacuole makes the cell rigid (turgid). The cell wall prevents the cell from bursting. Some protists have specialized contractile vacuoles for eliminating excess water and food vacuoles that contain food within the cell. Chloroplasts The diagram below illustrates how energy from sunlight is used for the energy requirements of cells. Photosynthesis is a process by which light energy is used to make sugar from CO 2 and H 2 O. The equation that summarizes these reactions is: Energy + 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 In eukaryotes, photosynthesis occurs in chloroplasts . Photosynthetic prokaryotes do not have
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Unformatted text preview: chloroplasts. The photograph below is an Elodea leaf (X 400). The numerous green structures are chloroplasts. Click on the photograph to view an enlargement. A double membrane surrounds the chloroplast. Chloroplasts contain membranous disk-like structures called thylakoids that are stacked together in larger structures (grana) that resemble stacks of coins (see diagram below). Molecules that absorb light energy (called photosynthetic pigments) are located in the thylakoid membranes. The fluid-filled space surrounding the grana is the stroma . Many enzymes needed in photosynthesis are found embedded in the thylakoid membranes and in the stroma. Click here to view the chapter on photosynthesis The diagram below shows a chloroplast that has been cut lengthwise to reveal the interior....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Vacuoles - chloroplasts. The photograph below is an Elodea...

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