Cell Transport Mechanisms and Processes

The video tutorial explains passive transport, focusing on diffusion, osmosis, and facilitated diffusion. It describes how molecules move across cell membranes without energy expenditure, using examples like oxygen and carbon dioxide exchange in the body. The video also covers the effects of different environments on cells, such as hypotonic and hypertonic solutions, and introduces facilitated diffusion, where larger molecules pass through protein channels.

What is passive transport?

• Movement of molecules using energy

• Movement of molecules without using energy

• Movement of molecules with the help of enzymes

• Movement of molecules against concentration gradient

In the context of diffusion, what does equilibrium mean?

• Molecules move to a higher concentration

• Molecules are evenly distributed

• Molecules require energy to move

• Molecules stop moving

How does oxygen enter cells through diffusion?

• Using ATP energy

• Through active transport

• From high to low concentration

• From low to high concentration

What is osmosis?

• Diffusion of solutes

• Diffusion of water

• Active transport of water

• Movement of water using energy

What happens to a cell in a hypotonic environment?

• It swells

• It remains the same

• It loses solutes

• It shrinks

In a hypertonic environment, what happens to a cell?

• It shrinks

• It swells

• It gains solutes

• It bursts

What is facilitated diffusion?

• Diffusion of large molecules with protein channels

• Movement of molecules using ATP

• Diffusion of small molecules

• Active transport of large molecules

Which molecules typically use facilitated diffusion?

• Oxygen

• Carbon dioxide

• Glucose

• Water

What role do protein channels play in facilitated diffusion?

• They provide energy for transport

• They help small molecules pass through

• They assist large molecules in crossing the membrane

• They block molecules from entering the cell

Which of the following is NOT a type of passive transport?

• Facilitated diffusion

• Osmosis

• Active transport

• Diffusion