volume_mute
Match each internal chloroplast structure to its correct description.
publish date: 2026/06/15 18:20:21.896963 UTC
volume_muteChloroplasts have a complex internal membrane system. Match each structure to its correct description.
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Structure
Stroma
Stroma lamellae
Grana lamellae
Grana
Description
Membranes connecting different grana stacks
Membranes within the grana stacks
Proteinaceous matrix surrounding the internal membranes
Stacks of disc-like membranous sacs (thylakoids)
Correct Answer
(1) Stroma,Proteinaceous matrix surrounding the internal membranes
(2) Grana,Stacks of disc-like membranous sacs (thylakoids)
(3) Grana lamellae,Membranes within the grana stacks
(4) Stroma lamellae,Membranes connecting different grana stacks
Explanation
The internal structure of a chloroplast:
- Stroma — the protein-rich fluid matrix that fills the chloroplast; site of carbon fixation reactions
- Grana (singular: granum) — stacks of membrane-enclosed disc-like sacs where light reactions occur
- Grana lamellae — the membranes forming the discs within each granum
- Stroma lamellae — membranes that interconnect the separate grana stacks
Reference
Biology: A Self-Teaching Guide