Question

which organelle is double membrane - bound? endoplasmic reticulum mitochondria golgi apparatus lysosome

Explanation:

Mitochondria have a double - membrane structure. The outer membrane is smooth and the inner membrane folds into cristae, increasing the surface area for cellular respiration processes. The endoplasmic reticulum, Golgi apparatus, and lysosome have single - membranes.

Answer:

Mitochondria