Physiology A protein to lipid ratio on a weight basis of 1:1 is present in the membrane of which organelle? A Inner mitochondrial membrane B Myelin C Plasma membrane of human erythrocyte D Sarcoplasmic reticulum 💡 Explanation A protein to lipid ratio on a weight basis of 1:1 is present in the membrane of which organelle? ✓ Correct Answer: C. Plasma membrane of human erythrocyte