Cell Membrane and Transport Flashcard

Front

What is the function of the hydrophobic fatty acid tail in the cell membrane?

Back

It is important for making the membrane semi-permeable.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to maintain membrane stability and reduce membrane permeability.

Front

Define selectively permeable in the context of cell membranes.

Back

A selectively permeable membrane allows the movement of only certain particles across it.

Front

What is the function of proteins in the cell membrane?

Back

Proteins help with the transport of materials across the membrane.

Front

Describe the process of diffusion.

Back

Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which particles move across a membrane with the help of transport proteins.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion occurs directly through the membrane, while facilitated diffusion requires specific proteins to assist the movement.

Front

What does it mean for a membrane to be at equilibrium?

Back

At equilibrium, the concentration of particles is equal on both sides of the membrane, and there is no net movement.

Front

What is the significance of the hydrophilic phosphate head in the cell membrane?

Back

The hydrophilic phosphate head is attracted to water, allowing the membrane to interact with the aqueous environment.

Front

Explain the term 'concentration gradient'.

Back

A concentration gradient is the difference in concentration of a substance between two areas.