18: Inside the Cell Membrane

What is the purpose of soaking eggs in vinegar for the osmosis lab?

• To harden the eggs

• To remove the shell and expose the membrane

• To change the color of the eggs

• To cook the eggs

Why can't a body cell be as large as a chicken egg?

• Because it would require too much energy

• Because it would be too heavy

• Because it would not fit inside the body

• Because the surface area to volume ratio would be too small

What does the surface area to volume ratio affect in a cell?

• The cell's temperature

• The cell's shape

• The cell's ability to transport materials

• The color of the cell

What is the Fluid Mosaic Model?

• A model describing the cell's nucleus

• A model describing the cell's DNA

• A model describing the cell membrane's structure and movement

• A model describing the cell's energy production

What is unique about phospholipids in the cell membrane?

• They do not interact with water

• They are completely polar

• They have a polar head and nonpolar tail

• They are completely nonpolar

What role does cholesterol play in the cell membrane?

• It transports proteins

• It stores energy

• It helps maintain membrane fluidity

• It makes the membrane rigid

What is the function of integral proteins in the cell membrane?

• They produce energy

• They store genetic information

• They go through the membrane and help transport materials

• They sit on the surface of the membrane

What is a glycoprotein?

• A carbohydrate with a lipid attached

• A lipid with a protein attached

• A protein with a carbohydrate attached

• A protein with a lipid attached

How does the HIV virus exploit the CD4 glycoprotein?

• By using it to bind to Helper T cells and infect them

• By using it to transport nutrients

• By using it to produce energy

• By using it to change the cell's shape

Why is understanding cell membrane components important in fighting diseases?

• It helps in increasing cell size

• It helps in changing the cell's color

• It helps in understanding how to target pathogens

• It helps in producing more cells