Why Would Hydrophilic Substances Such as Sodium Ions (Na⁺),hydrogen Ions

question 47

Multiple Choice

Why would hydrophilic substances such as sodium ions (Na⁺) ,hydrogen ions (H⁺) ,sugars,and amino acids be unable to simply diffuse across a plasma membrane?

• A) They readily mix with the hydrophobic tails forming the core of the phospholipid bilayer.
• B) They are repelled by the hydrophilic heads of the phospholipids that form the phospholipid bilayer.
• C) They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, they must move across by facilitated diffusion.
• D) They do not readily mix with the hydrophobic tails forming the core of the phospholipid bilayer; therefore, the only way they can move into the cell is by endocytosis.

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