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Biochemistry
Learn the toughest concepts covered in Biochemistry with step-by-step video tutorials and practice problems by world-class tutors
11. Biological Membranes and Transport
Passive vs. Active Transport
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1
concept
Passive vs. Active Transport
7m
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2
Problem
Passive membrane transport processes include___________.
A
Consumption of ATP for energy.
B
The use of transport proteins to move a substance from low to high concentration.
C
Movement of a substance down its concentration gradient.
D
Movement of a substance up its concentration gradient.
3
Problem
What is the difference between active and passive transport across a plasma membrane?
A
Active transport is used to move substances down their concentration gradient, where passive transport is used to move substances against their concentration gradient.
B
Active transport is ATP dependent, whereas passive transport does not require energy for movement across the plasma membrane.
C
Active transport implies that the cell is working with other cells, whereas passive transport implies that the cell does not cooperate with other cells.
D
Active transport means that the cell is aggressively going after substances that it wants to bring into the cell, whereas passive transport means that the cell just waits for the substance to cross the membrane.
4
concept
Passive vs. Active Transport
3m
Play a video:
5
Problem
A transport protein that simultaneously transports two different molecules in different directions is called:
A
A uniporter.
B
A symporter.
C
An equilibrium protein.
D
An antiporter.
E
A simple diffuser.
6
Problem
Which option below best describes a transporter that requires ATP to move molecules A and B out of the cell?
A
An active antiporter.
B
A passive antiporter.
C
A passive symporter.
D
An active uniporter.
E
An active symporter.