THE EXAMS POINTProtein production: one secretion pathway
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Protein production: one secretion pathway
01 · DNA in nucleus
A gene can be transcribed to RNA.
02 · mRNA → ribosome
Translation produces a polypeptide.
03 · Rough ER
A secreted protein enters the ER pathway during synthesis.
04 · Transport vesicle → Golgi
Modification and sorting prepare the product.
05 · Secretory vesicle → membrane
Exocytosis releases the product outside the cell.
Connect the branches
This pathway describes a secreted protein; many proteins function in the cytosol and do not follow it.
Avoid the exam trap
Ribosomes synthesize polypeptides. The Golgi does not translate mRNA.
Test yourself: Which structure directly translates mRNA?
A ribosome translates mRNA to synthesize a polypeptide.
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