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

Question 28

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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