Organelles such as mitochondria and the endoplasmic reticulum have membranes that compartmentalize reactions and other metabolic processes. To function properly, the organelles must move substances across their membranes.
Which of the following statements describes a feature shared by mitochondria and the endoplasmic reticulum that increases the efficiency of their basic
functions?
A
They have rigid, nonfluid membranes.
B
They have highly folded membranes.
С
They have membranes composed of many carbohydrates,
D
They have double membranes, with one membrane enclosed within the other