Which is not an example of transmembrane transport between different subcellular compartments?
Correct answer: D. Transport from the endoplasmic reticulum into the Golgi complex
- A. Transport from the stroma into thylakoid space
- B. Transport from the cytoplasm into the lumen of the endoplasmic reticulum
- C. Transport from mitochondrial intermembrane space into the mitochondrial matrix
- D. Transport from the endoplasmic reticulum into the Golgi complex
Explanation
Transport between the endoplasmic reticulum and the Golgi complex is mediated by vesicles that ferry the molecules, making this process distinct from transmembrane transport, as no membrane is crossed in the actual transport step. In contrast, the other options involve substances crossing a membrane to move between different compartments: from stroma to thylakoid space, cytoplasm to ER lumen, and mitochondrial intermembrane space to matrix.
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