[Campbell Biology P.152] Based on the information presented in Figure 6.10, if a protein is ... | Practice Question

Based on the information presented in Figure 6.10, if a protein is destined to be secreted from a cell, which type of ribosome would primarily synthesize it?

  • A: Free ribosomes in the cytosol
  • B: Ribosomes bound to the Endoplasmic Reticulum (ER)
  • C: Ribosomes found within mitochondria
  • D: Ribosomes located in the nucleolus

Explanation

The "DRAW IT" section asks the reader to circle a ribosome that might be making a protein that will be secreted, in the TEM showing ER and ribosomes. Proteins destined for secretion from the cell are typically synthesized on ribosomes bound to the endoplasmic reticulum, where they enter the ER lumen for further processing and transport.