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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Definitions:

Absorption Costing

An evaluation technique that assimilates all production costs, covering direct materials, direct labor, and variable and fixed overheads, into the price of a product.

Net Operating Income

An indicator of a firm's profitability from standard operations, excluding non-operational income and expenses like taxes and interest.

Operations

The activities involved in running a business, production, or system effectively and efficiently.

Contribution Margin

It refers to the amount of revenue remaining after deducting variable costs, which can contribute to covering fixed costs and generating profit.