alleryStart learning →What is the hollow interior of the endoplasmic reticulum tubules called?
AThe stroma space
BThe matrix space
CThe nucleoplasm
DThe cisternal space
Answer & Solution
Correct answer: D. The cisternal space
1. The ER is built from membranous sacs and tubules, and those tubules are hollow.
2. That hollow portion goes by two names, the lumen and the cisternal space.
3. Newly synthesized proteins are transferred into that lumen for modification.
4. Stroma and matrix are the internal fluids of chloroplasts and mitochondria, which sit outside the endomembrane system.
5. The ER interior is the cisternal space.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.4 The Endomembrane System and Proteins_
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