A thylakoid is a membrane-enclosed sac; its thylakoid membrane contains chlorophyll and light-dependent reactions machinery. A stack is a granum.[ref]
The membrane and its enclosed fluid answer different location questions. A soluble protein in thylakoid lumen is inside the sac; a membrane protein is embedded in its boundary and can expose different parts on the two sides. Membrane topology and organelle protein import provide the reusable language for those distinctions.
The fluid interior enclosed by the thylakoid membrane.
A stack of thylakoids.

Ancestors (4)

  1. Chloroplast
  2. Biological cell
  3. Biology
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