In the Section "Investigating Life: Does Natural Selection Maintain Cystic

question 36

Multiple Choice

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",CFTR moves chloride ions out of cells by active transport.What can be inferred from this statement when the CFTR is functioning?

• A)Chloride concentrations become higher on the outside of the cell.
• B)Chloride concentrations become higher on the inside of the cell.
• C)Sodium concentrations become higher on the outside of the cell.
• D)Sodium concentrations become higher on the inside of the cell.
• E)Water crosses membranes by active transport.

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