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Cell Biology
Learn the toughest concepts covered in Cell Biology with step-by-step video tutorials and practice problems by world-class tutors
9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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1
concept
Diffusion
4m
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2
concept
GLUT1 Transporter
2m
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3
concept
Osmosis
3m
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4
Problem
Which of the following describes the diffusion of water across a membrane?
A
Simple Diffusion
B
Facilitated Diffusion
C
Osmosis
D
Uniporters
5
Problem
The plasma membrane by itself is impermeable to all charged molecules.
A
True
B
False
6
Problem
Which of the following transport proteins transports two molecules across the membrane in the same direction?
A
Uniport
B
Symport
C
Antiport
D
Biport
7
Problem
Carrier proteins that transport molecules via facilitated diffusion require energy from ATP.
A
True
B
False
8
Problem
Isotonic is a term that describes what?
A
The cytoplasmic side of a membrane has a higher solute concentration
B
The extracellular side of a membrane has a higher solute concentration
C
Both sides of a membrane have equal solute concentrations