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Membrane Structure and Function
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WATCH ALL SLIDES

via phagocytosis (TEM)

Plasma

membrane

Vesicle

0.5 µm

Pinocytosis vesicles

forming (arrows) in

a cell lining a small

blood vessel (TEM)

RECEPTOR-MEDIATED ENDOCYTOSIS

Receptor

Coat protein

Coated

vesicle

Coated

pit

Ligand

Coat

protein

Plasma

membrane

A coated pit

and a coated

vesicle formed

during

receptor-

mediated

endocytosis

(TEMs)

0.25 µm

Slide 72

Fig. 7-20a

Fig. 7-20a

PHAGOCYTOSIS

CYTOPLASM

EXTRACELLULAR

FLUID

Pseudopodium

“Food” or

other particle

Food

vacuole

Food vacuole

Bacterium

An amoeba engulfing a bacterium

via phagocytosis (TEM)

Pseudopodium

of amoeba

1 µm

Slide 73

In pinocytosis, molecules are taken up when extracellular fluid is “gulped” into tiny vesicles

In pinocytosis, molecules are taken up when extracellular fluid is “gulped” into tiny vesicles

Animation: Pinocytosis

Slide 74

Fig. 7-20b

Fig. 7-20b

PINOCYTOSIS

Plasma

membrane

Vesicle

0.5 µm

Pinocytosis vesicles

forming (arrows) in

a cell lining a small

blood vessel (TEM)

Slide 75

In receptor-mediated endocytosis, binding of ligands to receptors triggers vesicle formation

In receptor-mediated endocytosis, binding of ligands to receptors triggers vesicle formation

A ligand is any molecule that binds specifically to a receptor site of another molecule

Animation: Receptor-Mediated Endocytosis

Slide 76

Fig. 7-20c

Fig. 7-20c

RECEPTOR-MEDIATED ENDOCYTOSIS

Receptor

Coat protein

Coated

pit

Ligand

Coat

protein

Plasma

membrane

0.25 µm

Coated

vesicle

A coated pit

and a coated

vesicle formed

during

receptor-

mediated

endocytosis

(TEMs)

Slide 77

Fig. 7-UN1

Fig. 7-UN1

Passive transport:

Facilitated diffusion

Channel

protein

Carrier

protein

Slide 78

Fig. 7-UN2

Fig. 7-UN2

Active transport:

ATP

Slide 79

Fig. 7-UN3

Fig. 7-UN3

Environment:

0.01 M sucrose

0.01 M glucose

0.01 M fructose

“Cell”

0.03 M sucrose

0.02 M glucose

Slide 80

Fig. 7-UN4

Fig. 7-UN4

Slide 81

You should now be able to:

You should now be able to:

Define the following terms: amphipathic molecules, aquaporins, diffusion

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