BIOS 2011 Lab 2 Photosynthesis

The area between the outer membrane and the thylakoid

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Unformatted text preview: he chloroplast is bounded by a double membrane, and contains flattened sacs or vesicles called thylakoids. The thylakoid membrane divides the chloroplast into discrete sections. The area between the outer membrane and the thylakoid stacks, or grana, is the stroma. The area enclosed by the thylakoid membrane is referred to as the thylakoid space. Although there are many grana in one chloroplast, these stacks are connected by lamellae so that the thylakoid space is continuous from one granum to the next. Because the stroma and interthylakoid substances are completely separated by the thylakoid membrane, they can maintain different chemical compositions. This compartmentalization of the chloroplast is crucial to the operations of photosynthesis. The energy ­trapping light reactions take place at the thylakoid membrane, and the carbon ­fixing dark reactions occu...
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