Cell Transport Mechanisms and Concepts

Mr. Davis reviews cell transport, covering passive and active transport. Passive transport requires no energy and moves particles from high to low concentration, while active transport requires energy (ATP) to move particles against the gradient. The video explains gradients, simple diffusion, and facilitated diffusion, and provides practice problems for students to apply their knowledge.

What are the two main types of cell transport?

• Osmosis and diffusion

• Passive and active transport

• Endocytosis and exocytosis

• Facilitated and simple diffusion

What determines whether cell transport is passive or active?

• The type of molecules involved

• The temperature of the environment

• The size of the cell

• The gradient and direction of particle movement

What is required for active transport to occur?

• Oxygen

• Water

• Sunlight

• ATP

Which of the following is an example of active transport?

• Facilitated diffusion of ions

• Osmosis of water

• Movement of glucose through a protein pump

• Diffusion of oxygen

What is the main characteristic of passive transport?

• It involves large molecules

• It moves particles from high to low concentration

• It moves particles from low to high concentration

• It requires energy

What is simple diffusion?

• Direct movement of small molecules through the cell membrane

• Movement of particles with the help of proteins

• Movement of water across a membrane

• Transport of large molecules using energy

How does facilitated diffusion differ from simple diffusion?

• It only occurs in plant cells

• It moves particles against the gradient

• It uses proteins to help move particles

• It requires energy

Which type of transport involves proteins that act as doors in the cell membrane?

• Osmosis

• Active transport

• Facilitated diffusion

• Simple diffusion

What should you do if you get stuck on practice problems?

• Rewatch the video examples

• Skip them

• Guess the answers

• Ask a friend for help

What should you identify when drawing sketches of cell transport?

• The color of the molecules

• The type of transport and whether it is simple or facilitated

• The size of the cell

• The temperature of the environment