Cell Membrane Intro

Which of the following is true of this phospholipid molecule?

• The fatty acid tails are polar, hydrophilic molecules.

• The phosphate head contains no phosphorus.

• The fatty acid tails are non-polar, hydrophobic molecules.

• Water passes easily through the fatty acid tails.

Which of the following is the name of the model of the cell membrane that states that the phospholipids, proteins, and other molecules that make up the membrane are not stationary (i.e., they move relative to one another).

• Cell impermeability model

• Enzyme lock and key model

• Theory of relativity

• Fluid mosaic model

Hydrophobic region of the cell membrane?

• E
• B
• C
• A 

Tags

NGSS.MS-LS1-2

Phospholipid heads are...

• Hydrophobic
• Hydrophilic

What forms the channels and pumps in the phospholipid bilayer?

• Carbohydrates
• Proteins
• Hydrophilic heads 
• Lipids

The function of the plasma membrane is....

• to regulate what enters and leaves the cell.
• fight bacteria and viruses that enter the cell.
• provide rigid support and protection to the cell.
• make sure each cell can move

Tags

NGSS.MS-LS1-2

True or False: Phospholipids can move laterally along the plane of the membrane. 

• True
• False

Why are unsaturated fatty acids able to best keep the membrane more "fluid"?

• Unsaturated fatty acids are more polar than saturated fatty acids. 
• The kinks in the tails of the unsaturated fatty acids prevent a dense network of lipids. 
• Unsaturated fatty acids are solid at room temperature. 
• The kinks in the tails of the unsaturated fatty acids make the region more dense. 

What is a phospholipid made out of?

• Plasma, Membrane fluid, and Glucose 
• Carbohydrates, Proteins, and cholesterol
• Ribosomes, Glycerol, and Plasma
• Glycerol, Two fatty acids, and a phosphate group

Which type of cell junction allows chemical messages to travel quickly from cell to cell?

• Tight junctions
• Gap junctions
• Desmosomes