In an Experiment Involving Planar Bilayers, a Solution of Table

question 38

Multiple Choice

In an experiment involving planar bilayers, a solution of table salt sodium and chloride ions in water) is added on the left side of the membrane, while pure water is added on the right side. After 30 minutes, the researchers test for the presence of ions on each side of the membrane. The right side tests negative for ions. What can you conclude?

• A) The water somehow blocked the movement of ions across the membrane.
• B) The left side would probably also test negative for ions.
• C) Ions cannot cross planar bilayers.
• D) The experiment failed.

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