Cell Transport Test Remediation

Front

What is a phospholipid bilayer?

Back

A phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier that separates the inside of the cell from the outside environment.

Front

What type of transport requires energy?

Back

Active transport requires energy to move substances against their concentration gradient.

Front

What is an isotonic solution?

Back

An isotonic solution is one that has the same concentration of solutes as the inside of a cell, preventing net movement of water and maintaining cell shape.

Front

What role does cholesterol play in the cell membrane?

Back

Cholesterol provides stability and strength to the cell membrane, helping to maintain its fluidity.

Front

Why do fatty acid tails of phospholipids face inward in a bilayer?

Back

Fatty acid tails are hydrophobic (water-repelling), so they face inward away from water, while the hydrophilic (water-attracting) phosphate heads face outward.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of transporting molecules across a cell membrane via protein channels, without the use of energy.

Front

What is the function of carrier proteins?

Back

Carrier proteins assist in the transport of substances across the cell membrane, often involved in active transport.

Front

What is the difference between hypotonic and hypertonic solutions?

Back

Hypotonic solutions have a lower concentration of solutes compared to the cell, causing cells to swell, while hypertonic solutions have a higher concentration, causing cells to shrink.

Front

What is the significance of the fluid mosaic model?

Back

The fluid mosaic model describes the structure of the cell membrane as a mosaic of various proteins that float in or on the fluid lipid bilayer, allowing for flexibility and movement.