Question

What Double outer membranes; membrane stacks on the inside

Answer 1

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Thylakoids are membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen. Chloroplast thylakoids frequently form stacks of disks referred to as grana (singular: granum). Grana are connected by intergranal/ stroma thylakoids, which join granum stacks together as a single functional compartment.

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