alleryStart learning →What is the internal space enclosed by the thylakoid membrane called?
AThe chloroplast stroma
BThe intermembrane space
CThe mesophyll cavity
DThe thylakoid lumen
Answer & Solution
Correct answer: D. The thylakoid lumen
1. The thylakoid membrane encloses an internal space.
2. That space is the thylakoid lumen, an aqueous space bound by the thylakoid membrane.
3. Protons accumulate there during light-driven electron transport.
4. The stroma is outside the thylakoid, surrounding the grana, so it is the wrong side of the membrane.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.1 Overview of Photosynthesis_
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