What Is the Best Reason Why Oxygen (O₂)can Cross the Plasma

question 54

Multiple Choice

What is the best reason why oxygen (O₂) can cross the plasma membrane by simple diffusion,but glucose must be transported across the barrier by facilitated diffusion?

• A)Oxygen is a much smaller molecule,making it easier to pass through the molecules of the plasma membrane.
• B)Oxygen is a nonpolar molecule,easily passing through the nonpolar middle area of the plasma membrane.
• C)Oxygen can be burned/consumed as it crosses the membrane,providing the energy needed for its passage.
• D)Glucose is nonpolar,making it very difficult for it to cross the polar portions of the plasma membrane structure.

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