Because learning changes everything.®
Chapter 05
Membranes
BIOLOGY
Thirteenth Edition
Raven, Johnson, Mason, Losos,
Duncan
© 2023 McGraw Hill, LLC. All rights reserved. Authorized only for instructor use in the classroom.
No reproduction or further distribution permitted without the prior written consent of McGraw Hill, LLC.
, Membrane Structure
Phospholipids arranged in a bilayer
• Include glycerol phospholipids and sphingolipids
Globular proteins inserted in the lipid bilayer
Fluid mosaic model – mosaic of proteins floats in or on the
fluid lipid bilayer like boats on a pond
© McGraw Hill, LLC 2
, Fluid Mosaic Model of Cell Membranes
Figure 5.3 Access the text alternative for slide images.
© McGraw Hill, LLC 3
, Cellular Membranes Have Four Components
1. Phospholipid bilayer
• Flexible matrix, barrier to permeability.
2. Transmembrane proteins
• Integral membrane proteins.
3. Interior protein network
• Peripheral or intracellular membrane proteins.
4. Cell-surface markers
• Glycoproteins and glycolipids.
© McGraw Hill, LLC 4
Chapter 05
Membranes
BIOLOGY
Thirteenth Edition
Raven, Johnson, Mason, Losos,
Duncan
© 2023 McGraw Hill, LLC. All rights reserved. Authorized only for instructor use in the classroom.
No reproduction or further distribution permitted without the prior written consent of McGraw Hill, LLC.
, Membrane Structure
Phospholipids arranged in a bilayer
• Include glycerol phospholipids and sphingolipids
Globular proteins inserted in the lipid bilayer
Fluid mosaic model – mosaic of proteins floats in or on the
fluid lipid bilayer like boats on a pond
© McGraw Hill, LLC 2
, Fluid Mosaic Model of Cell Membranes
Figure 5.3 Access the text alternative for slide images.
© McGraw Hill, LLC 3
, Cellular Membranes Have Four Components
1. Phospholipid bilayer
• Flexible matrix, barrier to permeability.
2. Transmembrane proteins
• Integral membrane proteins.
3. Interior protein network
• Peripheral or intracellular membrane proteins.
4. Cell-surface markers
• Glycoproteins and glycolipids.
© McGraw Hill, LLC 4
