Thylakoid membranes: system of interconnected flattened fluid-filled sacs - contains proteins, photosynthetic pigments and electron carriers
DNA loop: chloroplasts contain genes for some of their proteins
Stroma: fluid surrounding thylakoid membranes - contains all enzymes needed to carry out L-IR
Thylakoid space: fluid within the thylakoid membrane sacs - contains enzymes for photolysis
Granum: stack of thylakoids joined to each other (pl. grana)
Smooth inner membrane: contains many transporter molecules - these are membrane proteins which regulate the passage of substances in and out of chloroplast, such as sugars and proteins
Smooth outer membrane: this is freely permeable to molecules such as CO2 and H2O
Starch grain: stores the product of photosynthesis
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