Cellular Transport Honors Bio Practice

Front

What do the phosphate heads in a phospholipid bilayer represent?

Back

Phosphate heads are hydrophilic (water-attracting) components of the phospholipid bilayer.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which particles, like macromolecules, move across the cell membrane with the help of channel proteins, without the use of energy.

Front

Define concentration gradient.

Back

A concentration gradient is the difference in the concentration of a substance from one location to another.

Front

What does it mean for a cell membrane to be semipermeable?

Back

A semipermeable membrane allows certain substances to pass through while restricting others.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of small molecules, such as oxygen and carbon dioxide, across the plasma membrane along the concentration gradient without the need for energy.

Front

What role do channel proteins play in cellular transport?

Back

Channel proteins facilitate the movement of larger or charged particles across the cell membrane.

Front

What is the significance of the hydrophobic tails in phospholipids?

Back

The hydrophobic tails are water-repelling components that help form the barrier of the cell membrane.

Front

How does temperature affect the rate of diffusion?

Back

Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.