What Best Explains the Double-Headed Arrows Associated with Water, Carbon

question 29

Multiple Choice

What best explains the double-headed arrows associated with water, carbon dioxide, and molecular oxygen shown in the illustration below?

• A)Each molecule is unable to cross the membrane, but can be found in relatively large numbers on both sides.
• B)The membrane is permeable to these small molecules and they enter or leave rapidly as their concentration gradients change.
• C)An isotonic condition exists for each molecule, so no net movement takes place.
• D)Homeostasis requires that surplus molecules entering the cell be rejected and returned to the outside.

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