Examine the experimental chamber in the figure below. If the lipid bilayer were

Question

Examine the experimental chamber in the figure below. If the lipid bilayer were to contain the CFTR molecule, what would pass through the membrane if you added a 1 M solution of sodium chloride on the left side and a 1.5 M solution of potassium ions on the right? Assume that there is an equal amount of water on each side at the start of the experiment. Select all that apply. potassium ions chloride ions sodium ions water will initially move from the right to the left, then backward water will initially move from the left side to the right, then backward water would move from the left to the right none of the above

Explanation / Answer

If the lipid bilayer were to contain the CFTR molecule, what would pass through the membrane if you added a 1-molar solution of sodium chloride on the left side and a 1-molar solution of potassium ions on the right? Assume that there is an equal amount of water on each side at the start of the experiment.

Answer:

Chloride ions from sodium chloride will move from the left side to the right through the CFTR, since the CFTR functions as a channel for the movement of chloride ions in and out through the membrane in the chamber. Water will initially move from the right side to the left by osmosis, then backward as chloride ions move to the right, water will follow. Sodium(Na+) and Potassium (K+) ions will not move across the membrane.

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