Question

The thickness of unit membrane is

• A. $ 20\overset{\text{o}}{\mathop{\text{A}}}\, $
• B. $ 35\overset{\text{o}}{\mathop{\text{A}}}\, $
• C. $ 55\overset{\text{o}}{\mathop{\text{A}}}\, $
• D. $ 75\overset{\text{o}}{\mathop{\text{A}}}\, $

Answer 1

Answer: (D)

The unit membrane, described by J David Robertson, was considered as $ 75{\AA} $ thick trilaminar (3 layered membrane). According to his unit membrane or trilaminar model, unit membrane consists of $ 35{\AA} $ thick bimolecular phospholipid layer between two protein layers, each with $ 20{\AA} $ thickness.