Question

Choose the correct answer from the alternatives given.
When a plasma membrane is split by freeze fracture into its outer and inner leaflets, the bumps visualized in electron micrographs are replicas of

• A. Integral proteins
• B. Cholesterol molecules
• C. Phospholipids
• D. Peripheral proteins

Answer 1

The correct option is A Integral proteins

The technique of freeze fracture is applied to get an idea about the distribution of the integral proteins on a membrane. This technique splits a plasma membrane into its inner and outer inner leaflets, and bumps are visualized on the electron micrographs which are nothing but the integral proteins of the membrane.

So, the correct answer is 'Integral proteins'.