Cell Membrane Structure and Function

Josh Patel explains the cell membrane's structure and function, focusing on its role as a barrier and its selective permeability. The cell membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. The fluid mosaic model describes its dynamic nature. The membrane's selective permeability allows certain molecules to pass while blocking others. The video concludes with a summary of key points and a preview of the next lesson on osmosis and diffusion.

What is the primary function of the cell membrane?

• To synthesize proteins

• To produce energy for the cell

• To store genetic information

• To separate the cell from its external environment

What is the cell membrane primarily composed of?

• Proteins

• Phospholipids

• Nucleic acids

• Carbohydrates

What is the arrangement of phospholipids in the cell membrane called?

• Monolayer

• Bilayer

• Trilayer

• Quadlayer

Which model describes the structure of the cell membrane?

• Rigid Framework Model

• Fluid Mosaic Model

• Static Model

• Solid State Model

What does it mean when the cell membrane is described as selectively permeable?

• It allows all molecules to pass through

• It blocks all molecules from passing through

• It allows some molecules to pass while blocking others

• It only allows water to pass through

What role do protein channels play in the cell membrane?

• They store energy

• They replicate DNA

• They allow proteins to enter and exit the cell

• They synthesize lipids

What are ligands in the context of cell membranes?

• Proteins that provide structural support

• Lipids that form the bilayer

• Carbohydrates that provide energy

• Chemical messages that bind to receptors

What is the function of membrane receptors?

• To store genetic information

• To synthesize proteins

• To bind with ligands and transmit signals

• To produce energy

What is the significance of the polar heads and nonpolar tails in the phospholipid bilayer?

• They provide energy to the cell

• They create a barrier that is selectively permeable

• They synthesize proteins

• They determine the cell's genetic code

What should you do if you missed something in the lesson?

• Ask a friend for the answers

• Ignore it and move on

• Review the book or watch the video again

• Skip the topic entirely