BPSC – Combined Competitive Examination · Question 142

Biological membranes are composed of:

Lipids and proteins in varying combinations specific to each species, cell type and organelle
Lipids only
Proteins only
None of the above

Show answer & explanation

Answer: (A) Lipids and proteins in varying combinations specific to each species, cell type and organelle

Explanation

Membranes are lipid–protein assemblies (with some carbohydrate) whose ratio differs between cell types.

(A) Correct
Correct: the fluid mosaic model: a lipid bilayer with proteins, varying by cell type.
(B) Incorrect
Wrong: membranes also contain proteins.
(C) Incorrect
Wrong: membranes also contain lipids.
(D) Incorrect
Wrong: option A is correct.