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While moving from cis cisternae to the trans cisternae, which molecule does not leave the cisternal lumen?

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While moving from cis cisternae to the trans cisternae, which molecule does not leave the cisternal lumen?

(a) membrane proteins

(b) procollagen

(c) oligosaccharides

(d) lysosomal proteins

I got this question in an online quiz.

Question is taken from Cytoplasmic Membrane Systems topic in chapter Cytoplasmic Membrane Systems of Cell Biology

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Right option is (b) procollagen

The explanation is: Procollagen molecules are the precursors of extracellular collagen found in fibroblasts. They move from cis cisternae to the trans cisternae without ever leaving the cisternal lumen.

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