321 Cell Membrane and Transport Assessment 2024 Nelson

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails, forming a bilayer in cell membranes.

Front

What is the function of carbohydrates in the cell membrane?

Back

Carbohydrates serve as recognition sites for cell signaling and help in cell-cell communication.

Front

Define equilibrium in the context of cell transport.

Back

Equilibrium occurs when the concentration of particles inside the cell is equal to the concentration outside the cell, resulting in no net movement of particles.

Front

What is osmosis?

Back

Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What role do proteins play in the plasma membrane?

Back

Proteins form channels and pumps that facilitate the transport of substances across the plasma membrane.

Front

What is the primary function of the plasma membrane?

Back

The primary function of the plasma membrane is to regulate what enters and leaves the cell.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a membrane via specific transmembrane integral proteins.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What is the significance of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.