10. Analyze the statements about the cell membrane.
a) The detailed structure was studied only after the advent of the electron microscope in the 1950s.
b) The membrane is mainly composed of lipids (phospholipids and cholesterol) and proteins.
c) In the lipid bilayer, polar heads face the inner part and hydrophobic tails face the outer sides.
d) In human erythrocytes, the membrane has approximately 52% protein and 40% lipids.
e) Peripheral proteins are partially or totally buried in the membrane.
f) The fluid mosaic model was proposed by Schleiden and Schwann.
g) The fluid nature of the membrane is important for functions like cell growth, secretion, and endocytosis.