Question

which of the following would contain no phospholipid bilayer or \endomembrane\ in its structure?
a) nucleus
b) er
c) mitochondria
d) ribosomes

Explanation:

The nucleus has a nuclear envelope made of a phospholipid bilayer. The endoplasmic reticulum (ER) is a membrane - bound organelle with a phospholipid bilayer. Mitochondria have an outer and inner membrane composed of phospholipid bilayers. Ribosomes are non - membrane bound organelles and do not have a phospholipid bilayer or endomembrane structure.

Answer:

D. ribosomes