Facilitated Diffusion and Cell Transport

This video tutorial by Josh Patel covers Chapter 3, Lesson 4 on cell structure and function, focusing on diffusion and osmosis. It explains how materials move across cell membranes due to concentration differences, highlighting passive transport mechanisms like diffusion and osmosis. The video also discusses isotonic, hypertonic, and hypotonic solutions and introduces facilitated diffusion through transport proteins. The lesson concludes with a preview of the next topic on active transport.

What is the primary function of a cell membrane in terms of concentration difference?

• To maintain a constant temperature

• To create energy for the cell

• To store genetic information

• To regulate the movement of materials based on concentration difference

Which of the following best describes passive transport?

• Movement of molecules from low to high concentration using energy

• Movement of molecules from high to low concentration without energy

• Movement of molecules from high to low concentration using energy

• Movement of molecules from low to high concentration without energy

What is the main difference between diffusion and osmosis?

• Diffusion requires energy, while osmosis does not

• Osmosis requires energy, while diffusion does not

• Osmosis involves water, while diffusion involves any molecule

• Diffusion involves water, while osmosis involves any molecule

In an isotonic solution, what happens to the cell?

• The cell shrinks

• The cell expands

• The cell remains the same size

• The cell bursts

What occurs to a cell in a hypertonic solution?

• The cell bursts

• The cell expands

• The cell shrinks

• The cell remains the same size

How does a hypotonic solution affect a cell?

• The cell becomes isotonic

• The cell expands or bursts

• The cell shrinks

• The cell remains the same size

What is facilitated diffusion?

• Diffusion of molecules using energy

• Diffusion of molecules through a transport protein

• Diffusion of molecules against a concentration gradient

• Diffusion of water molecules only

Which molecules require facilitated diffusion?

• Water molecules only

• Large or polar molecules

• Small and nonpolar molecules

• Ions only

What is the role of transport proteins in facilitated diffusion?

• They provide energy for diffusion

• They create a concentration gradient

• They prevent molecules from entering the cell

• They assist in the passage of molecules across the membrane

What topic will be covered in the next lesson?

• Protein synthesis

• Photosynthesis

• Active transport, endocytosis, and exocytosis

• Cell division