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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
ISBN: 9781305967359

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BuyFindarrow_forward

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
ISBN: 9781305967359
Textbook Problem

________ do not easily diffuse across a lipid bilayer.

a. Water molecules c. Ions
b. Gases d. Nonpolar molecules

Summary Introduction

Introduction:

A concentration gradient is defined as the difference in the solute concentration between adjacent regions of a solution. In diffusion, the movement of a substance occurs from an area of high concentration to an area of low concentration.

Explanation

Reason for correct answer:

Option c. is given as “Ions”.

The lipid bilayers present in cell membranes are selectively permeable. It allows the diffusion of some substances such as hydrophobic molecules, gases, and small uncharged polar molecules. However, it does not allow the diffusion of ions, charged molecules and large uncharged polar molecules.

Reason for incorrect answer:

Optiona. is given as,“Water molecules”.

Water diffusion occurs due to differences in solute concentration across the lipid bilayer. However, ions do not easily diffuse across a lipid bilayer...

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