12 Questions
What is the primary characteristic of facilitated diffusion?
Relies on a finite number of carrier proteins
Which statement is true about primary active transport?
All carriers act as enzymes with ATPase activity
What is the function of the Na+-K+-ATPase pump?
Establishes a chemical potential difference between ECF and ICF
What is a distinguishing feature of secondary active transport?
Movement of molecules in opposite directions
Which factor does NOT contribute to an increase in the rate of facilitated diffusion?
Higher molecular size
What happens at high extracellular fluid concentrations during facilitated diffusion?
The rate of diffusion decreases due to carrier saturation
What is the main characteristic of molecules that undergo facilitated diffusion?
Polar and any size molecule
In facilitated diffusion, how do substances move across the membrane?
Against the concentration gradient with the help of carrier proteins
Which type of transport involves moving substances against their concentration gradient?
Active transport
What is a common example of primary active transport?
Na+/K+ ATPase pump
What type of molecules are typically transported through active carrier-mediated transport?
Polar and any size molecule
What is the major difference between facilitated diffusion and active transport?
Facilitated diffusion requires energy, while active transport does not.
Test your knowledge on membrane transport mechanisms including facilitated diffusion, specificity, saturation, and competition. Learn about the characteristics and factors affecting passive carrier-mediated diffusion across membranes.
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