Essential Cell Biology
Essential Cell Biology
4th Edition
ISBN: 9780815344544
Author: Keith Roberts, Karen Hopkin, Alexander D Johnson, Martin Raff, Dennis Bray, Bruce Alberts, Julian Lewis, Peter Walter
Publisher: TAYLOR
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Chapter 11, Problem 1Q
Summary Introduction

To explain: How water molecules reorganize into a cage-like structure around the hydrophobic compounds.

Introduction: Water molecules in the ice are arranged in such a way that forms a cage-like structure due to the formation of intermolecular hydrogen bond in between the oxygen and hydrogen atom of two different water molecules.

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Explanation of Solution

Refer to the Fig 11-9, “A hydrophobic molecules tend to avoid water”, in the text book. It shows the reorganization of water molecules into a cage-like structure around the hydrophobic compound. Hydrophobic molecules are water insoluble molecules that cannot form favorable interaction with the water molecules.

The hydrogen bonds between the water molecules are continuously broken and formed by the action of thermal motion. When a water molecule comes near to the hydrophobic molecules, its motion is restricted because hydrogen bonds cannot be formed in the direction of hydrophobic molecules. As a result, they force adjacent water molecules to reorganize into a cage-like structure around them.

Summary Introduction

To compare: The cage-like structure of water with ice.

Introduction: Water molecules in the ice are arranged in such a way that forms a cage-like structure due to the formation of intermolecular hydrogen bond in between the oxygen and hydrogen atom of two different water molecules.

Expert Solution
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Explanation of Solution

The hexagonal ice gives an open cage-like structure because each oxygen atom in the ice is surrounded by four hydrogen atoms by covalent bond and hydrogen bond. The cage-like structure is less organized, more transient, and considerably less network than a small crystal of ice.

Summary Introduction

To explain: Why the cage-like structure would be energetically unfavorable.

Introduction: Water molecules in the ice are arranged in such a way that forms a cage-like structure due to the formation of intermolecular hydrogen bond in between the oxygen and hydrogen atom of two different water molecules.

Expert Solution
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Explanation of Solution

The cage-like structure is a highly ordered structure.  During its formation, free energy is required and the cost of the free energy is decreased when the hydrophobic molecules are aggregated to form a cluster. The entropy of the system decreases; hence, the “cage-like” structure would be energetically unfavorable.

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