Domanda del libro di testo
Which of the following forms of membrane transport require specific membrane proteins?
a. diffusion;
b. exocytosis;
c. facilitated diffusion;
d. active transport;
e. facilitated diffusion and active transport
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2. Cell Chemistry & Cell Components
Active Transport
Scelta multipla
Which of the following membrane proteins is involved in active transport?
A
Aquaporin
B
G-protein coupled receptor
C
Ion channel
D
Sodium-potassium pump
Guida verificata passo dopo passo1
Understand the concept of active transport: Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.
Identify the role of membrane proteins in active transport: Membrane proteins involved in active transport use energy to move substances against their concentration gradient.
Examine the function of each protein option: Aquaporins facilitate water transport, G-protein coupled receptors are involved in signal transduction, and ion channels allow passive movement of ions.
Focus on the sodium-potassium pump: This pump is a type of membrane protein that actively transports sodium ions out of the cell and potassium ions into the cell, using ATP.
Conclude that the sodium-potassium pump is the correct answer: It is directly involved in active transport, moving ions against their concentration gradient using energy.
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