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Glucose transport into erythrocytes (not into intestinal epithelial cells) is an example of:
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11. Biological Membranes and Transport
Erythrocyte Facilitated Transporter Models
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Which of the following statements is FALSE concerning the chloride-bicarbonate exchanger?
A
The exchanger increases the rate of bicarbonate transport across the membrane.
B
The exchanger uses ATP as an energy source to drive bicarbonate transport.
C
The exchanger transports chloride ions across the membrane.
D
The exchanger is classified as an antiporter.
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Understand the function of the chloride-bicarbonate exchanger: It facilitates the exchange of chloride ions (Cl⁻) and bicarbonate ions (HCO₃⁻) across the cell membrane.
Recognize that the exchanger is classified as an antiporter: An antiporter is a type of transport protein that moves two or more different ions or molecules in opposite directions across a membrane.
Identify the energy source for the exchanger: The chloride-bicarbonate exchanger operates through passive transport, meaning it does not require ATP or any other form of energy to function.
Clarify the mechanism of transport: The exchanger increases the rate of bicarbonate transport by coupling it with chloride ion transport, allowing for efficient exchange without direct energy input.
Determine the false statement: Given the understanding that the exchanger does not use ATP, the statement claiming it uses ATP as an energy source is false.
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