Answer
Mitochondria and chloroplasts share multiple membranes, one of which is highly folded, studded with proteins for ATP production.
Work Step by Step
Look at the images in Figures 4.16 and 4.17. Both have more than one membrane and the one which is involved in ATP production shows proteins attached to it. The folding is important for giving lots of surface area to the membrane allowing for lots of transport during ATP production.