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

question 62

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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Definitions:

Storage Granules

Intracellular compartments or vesicles in cells that store and release various substances, including hormones, neurotransmitters, and nutrients.

Vesicles

Vesicles are small, membrane-bound sacs within cells that transport and store substances such as neurotransmitters and proteins between cell compartments.

Membranous Compartments

Membranous compartments are enclosed regions within cells defined by lipid bilayers, serving various functions and hosting specific biochemical processes crucial for cellular activities.

Neurotransmitters

Neurotransmitters are chemical messengers that transmit signals across a chemical synapse from one neuron to another, influencing mental state and behavior.