Mr. Anderson provides an overview of the cell membrane, explaining its function in regulating material movement. He uses the muskox analogy to describe the amphipathic nature of phospholipids, which have hydrophilic heads and hydrophobic tails. The fluid mosaic model is introduced, highlighting the dynamic and diverse composition of the membrane, including phospholipids and proteins. The video also covers the role of proteins in facilitating transport and maintaining membrane fluidity, with a focus on diffusion and active transport mechanisms.

What is the primary function of the cell membrane?

• To store genetic information

• To provide energy to the cell

• To produce proteins

• To regulate what enters and exits the cell

What is a phospholipid composed of?

• A phosphate group and a lipid tail

• A sugar and a protein

• A carbohydrate and a lipid

• A protein and a nucleic acid

Why is a phospholipid considered amphipathic?

• It can move freely within the cell membrane

• It is made up of both proteins and lipids

• It can dissolve in both water and oil

• It has a hydrophilic head and a hydrophobic tail

What does the fluid mosaic model describe?

• The rigid structure of the cell membrane

• The movement and variety of components within the cell membrane

• The genetic makeup of the cell

• The process of protein synthesis

What are the two major components of the cell membrane?

• Water and ions

• Lipids and sugars

• Proteins and phospholipids

• Carbohydrates and nucleic acids

What is the role of phospholipids in the cell membrane?

• To produce proteins

• To store genetic information

• To keep water on either side of the membrane

• To provide energy

What is the function of proteins in the cell membrane?

• To store energy

• To allow material to enter and exit the cell

• To provide structural support

• To produce lipids

How does oxygen typically enter a cell?

• By facilitated diffusion

• Through active transport

• By osmosis

• Through diffusion

What are aquaporins?

• Proteins that allow water to move through the cell membrane

• Nucleic acids that store genetic information

• Carbohydrates that provide structural support

• Lipids that store energy

What characteristic of the cell membrane allows it to maintain fluidity?

• The presence of cholesterol

• The lack of movement within the membrane

• The rigidity of the phospholipids

• The fixed position of proteins