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 $ \overset{0}{\mathop{A}}\, $ thick trilaminar (3 layered membrane). According to his unit membrane or trilaminar model, unit membrane consists if 35 A thick bimolecular phospholipid layer between two protein layers, each with 20 $ \overset{0}{\mathop{A}}\, $ thickness.