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A thylakoid is part of an internal membrane system of chloroplasts folded repeatedly into a stack of disks called grana. Thylakoids have light absorbing pigments (chlorophylls) and enzymes required to form ATP, NADPH, or both in photosynthesis. The stacks connect (by membranous channels) as a single functional compartment. The molecular mechanism of ATP generation in chloroplasts is similar to that in mitochondria.
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