From 1950 to 2050 in the U

question 17

Multiple Choice

From 1950 to 2050 in the U. S., the proportion of people age 65 and over in the population is expected to:

• A) decline slightly
• B) remain constant
• C) increase slightly
• D) increase dramatically

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Definitions:

Phospholipids

A class of lipids that are a major component of all cell membranes, essential for cellular function.

Polar (Hydrophilic) Region

A part of a molecule that has a tendency to interact with water through hydrogen bonding or electrostatic interaction, making it soluble in water.

Plasma Membrane

The lipid bilayer that surrounds a cell, providing a barrier and regulating the movement of substances in and out of the cell.

Phospholipids

A class of lipids that are a major component of all cell membranes, forming bilayers that act as a barrier in cells.