Question

All are membrane bound cell organelles except

• A. Mitochondria
• B. Lysosomes
• C. Spherosomes
• D. Ribosomes

Answer 1

The correct option is D Ribosomes

• The limiting membrane of cells and cellular organelles which is composed of 3-layered structure- an inner lipid layer and two outer protein layers.
• This unit membrane surrounds most of the cellular organelles (Golgi apparatus, microbody, lysosomes etc.).
• Ribosomes are non-membranous cellular organelle thus, it lacks a unit membrane,
  
• So, the correct answer is 'Ribosome'.