Biomembrane I: Passive and Active Transport

Biomembranes I: Membrane Structure and Transport

Introduction

Concept 1: Membrane Structure
Practice (1 page)
Review (1 page)

Concept 2: Osmosis: Movement of Water Across Membranes
Practice (1 page)
Review (4 pages)

Concept 3: Selective Permeability of Membranes
Practice (1 page)
Review (4 pages)

Concept 4: Passive and Active Transport

Practice (2 pages)
Review (2 pages)

Concept 5: Mechanisms of Active Transport
Practice (1 page)
Review (4 pages)

Self-Quiz

Concept 4: Passive and Active Transport

Most biologically important solutes require protein carriers to cross cell membranes, by a process of either passive or active transport.

To rerun these animations go to the review page.

Active transport uses energy to move a solute "uphill" against its gradient, whereas in facilitated diffusion, a solute moves down its concentration gradient and no energy input is required.