Cellular Transport: Key Concepts and Functions

The video tutorial explains cellular transport mechanisms, focusing on the selectively permeable plasma membrane. It covers diffusion, osmosis, and active transport, highlighting how molecules move across cell membranes. Diffusion involves movement from high to low concentration, while osmosis specifically refers to water movement. Active transport requires energy to move substances against a concentration gradient. The video also discusses endocytosis and exocytosis, processes where cells intake and expel materials, respectively.

What is the plasma membrane also known as?

• Impermeable membrane

• Non-permeable membrane

• Selectively permeable membrane

• Permeable membrane

Which method is the primary way small molecules move across the cell membrane?

• Facilitated diffusion

• Diffusion

• Active transport

• Osmosis

What is passive transport?

• Movement of molecules using energy

• Movement of large particles

• Movement of molecules without using energy

• Movement of water molecules only

What is the process called when water diffuses across a selectively permeable membrane?

• Facilitated diffusion

• Active transport

• Diffusion

• Osmosis

Why is osmosis important for cells?

• It only occurs in plant cells

• It uses energy to move molecules

• It maintains homeostasis by regulating water flow

• It helps in the movement of large particles

What helps move materials across the plasma membrane in facilitated diffusion?

• Energy molecules

• Transport proteins

• Carrier proteins

• Water molecules

What is the role of transport proteins in facilitated diffusion?

• They create a concentration gradient

• They help passive transport materials

• They engulf particles

• They use energy to move particles

What is required for active transport to occur?

• Energy

• Water molecules

• Oxygen

• Food molecules

What is endocytosis?

• The process of passive transport

• The process of expelling materials from the cell

• The process of taking materials into the cell

• The process of water diffusion

What is the reverse process of endocytosis?

• Facilitated diffusion

• Diffusion

• Exocytosis

• Osmosis