Chapter 5 - Working Cell: Membrane Transport Flashcard

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically moving down their concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that requires specific transport proteins to help substances cross the plasma membrane.

Front

What is the primary function of the plasma membrane?

Back

The primary function of the plasma membrane is to control the movement of substances in and out of the cell.

Front

What is the structure of the plasma membrane?

Back

The plasma membrane is composed of a phospholipid bilayer with proteins embedded within it.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy input from the cell.

Front

What role do transport proteins play in membrane transport?

Back

Transport proteins facilitate the movement of ions and molecules across the plasma membrane, especially for substances that cannot freely pass through.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of substances during diffusion.

Front

What is selective permeability?

Back

Selective permeability is the property of a cell membrane that allows certain substances to pass while blocking others.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their gradient.