Cell Membrane Structure and Function

The video tutorial covers the structure and function of the cell membrane, including its composition of phospholipids and the role of hydrophilic heads and hydrophobic tails. It explains the concept of the phospholipid bilayer and the function of membrane proteins. The video also discusses passive transport mechanisms like diffusion and facilitated diffusion, as well as osmosis and its effects on cells in different solutions. Finally, it covers active transport processes, including the use of ATP, protein pumps, endocytosis, and exocytosis.

What is the primary component of the cell membrane?

• Nucleic acids

• Carbohydrates

• Phospholipids

• Proteins

What characteristic do the hydrophilic heads of phospholipids have?

• They are nonpolar

• They are hydrophobic

• They repel water

• They attract water

What is the role of membrane proteins in the cell membrane?

• They store energy

• They facilitate transport

• They provide structural support

• They synthesize lipids

Which type of transport does not require energy?

• Endocytosis

• Active transport

• Exocytosis

• Facilitated diffusion

What is osmosis?

• Facilitated diffusion of proteins

• Active transport of ions

• Diffusion of water across a selectively permeable membrane

• Movement of solutes across a membrane

In a hypertonic solution, what happens to a cell?

• It swells

• It shrinks

• It remains the same

• It bursts

What is the effect of an isotonic solution on a cell?

• The cell bursts

• The cell remains the same

• The cell swells

• The cell shrinks

What is the main energy source for active transport?

• FADH2

• NADH

• ATP

• Glucose

What process involves the cell membrane folding in to bring substances into the cell?

• Osmosis

• Exocytosis

• Endocytosis

• Diffusion

How does ATP release energy for cellular processes?

• By forming new bonds

• By absorbing water

• By breaking a phosphate bond

• By converting to ADP