[Campbell Biology P.959] Based on Figure 41.13, chylomicrons leave the epithelial cells by e... | Practice Question

Based on Figure 41.13, chylomicrons leave the epithelial cells by exocytosis. Does this process require an input of energy, and why?

  • A: No, exocytosis is a passive process that allows large molecules to exit the cell without energy.
  • B: Yes, exocytosis is a form of active transport that requires ATP to form vesicles and move them to the membrane.
  • C: No, the concentration gradient of chylomicrons drives their exit from the cell.
  • D: Yes, but only for the initial breakdown of triglycerides into fatty acids and monoglycerides.

Explanation

Exocytosis is a type of bulk transport that moves substances out of the cell. It involves the fusion of vesicles with the plasma membrane, a complex process that requires energy in the form of ATP to drive vesicle formation, movement along the cytoskeleton, and membrane fusion. This is an active process.