The structure of vacuoles is quite simple. There is a membrane that surrounds the bulk of the liquid. This liquid contains nutrients or wastes. Plants can also use vacuoles to store water. These tiny water bags help support the plant. They are closely related to objects called vesicles that are found throughout the cell.
Two membranes contain and protect the inner parts of the chloroplast. They are called outer and inner membranes. The inner membrane surrounds the stroma and green (thylakoid stacks). One thylakoid stack is called a granule. Chlorophyll molecules sit on the surface of each thylakoid and capture the light energy from the sun. Since the energy-rich molecules are created by light-dependent reactions, they move to the stroma, where carbon (C) can be fixed and sugars synthesized.
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