Multiple Choice
Which option below best describes a transporter that requires ATP to move molecules A and B out of the cell?
11. Biological Membranes and Transport
Passive vs. Active Transport
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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.
Verified step by step guidance1
Understand the types of transport proteins: Transport proteins facilitate the movement of molecules across the cell membrane. They can be classified based on the direction and number of molecules they transport.
Define a uniporter: A uniporter transports a single type of molecule across the membrane in one direction.
Define a symporter: A symporter transports two different molecules in the same direction across the membrane.
Define an antiporter: An antiporter transports two different molecules in opposite directions across the membrane. This is the key characteristic that matches the problem statement.
Identify the correct term: Based on the definitions, the transport protein described in the problem is an antiporter, as it moves two different molecules in different directions.
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