Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special proteins called transport proteins.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Osmosis specifically refers to the movement of water molecules across a selectively permeable membrane.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP) to do so.

Front

What is selective permeability?

Back

Selective permeability is the ability of a cell membrane to allow certain substances to pass through while blocking others.

Front

What is the role of transport proteins in cell transport?

Back

Transport proteins facilitate the movement of substances across the cell membrane, either by providing a passageway or by actively transporting molecules.

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 happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water moves into the cell, causing it to swell and potentially burst.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules from high to low concentration.

Front

What is the significance of ATP in active transport?

Back

ATP provides the energy required for active transport to move substances against their concentration gradient.

Front

What is simple diffusion?

Back

Simple diffusion is the process by which small or nonpolar molecules move directly through the phospholipid bilayer of a cell membrane from an area of high concentration to an area of low concentration.