Chapter 7, Problem 7.1CC

Which functions of a membrane would be compromised if the membrane consisted of a phospholipid bilayer without proteins? What about a membrane without phospholipids?

Summary Introduction

To determine: The functions of a membrane that would be compromised if the membrane consisted of phospholipid bilayer without proteins.

Introduction: The membrane protein refers to the type of protein that is either attached or linked to the cell membrane or the organelle. It constitutes an essential part of the cell membrane and performs various functions.

Explanation of Solution

The absence of proteins in the phospholipid will hamper the following functions of a membrane:

• In the membrane, protein works as an enzyme for catalyzation of the reaction. The absence of which will result in loss of catalysation function.
• Protein in the membrane acts as a receptor for molecules. In the absence of which the cells will receive the molecules.
• A protein present in the membrane works as a transporter for molecules both within the cell and outside the cell. The absence of which will result in loss of transportation function.

Hence, all the above-mentioned functions will be compromised if the membrane consisted of phospholipid bilayer without proteins.

Summary Introduction

To explain: A membrane without phospholipids.

Introduction: The membrane protein refers to the type of protein that is either attached or linked to the cell membrane or the organelle. It constitutes an essential part of the cell membrane and performs various functions.

Explanation of Solution

• Phospholipids act as a barrier and protect the various cell organelles present. In the absence of phospholipids, the molecules and other charged particles can easily invade the cell and affect its functioning.
• Phospholipids give a structure to the membrane of the cell. The absence of phospholipids will hamper the structure of the cell.
• The phospholipid permits lateral diffusion of lipids in the membrane. The absence of phospholipids will inhibit lateral diffusion of proteins and lipids