Answer: Directs ribosome-mRNA complex to rough ER.
- A Initiates unwinding of the DNA double helix at the origin of replication
- B Directs ribosome-mRNA complex to rough ER
- C Enzymatically cleaves the signal peptide once translocation is complete
- D Catalyzes correct folding of nascent polypeptides within the ER lumen
Correct answer: B. Directs ribosome-mRNA complex to rough ER
Explanation: SRP recognizes the signal sequence on a growing polypeptide and targets the ribosome-mRNA complex to the rough ER membrane.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.