Cell Biology Objective Questions

The phospholipid head is _____________ & _____________

• Hydrophilic

• Hydrophobic

• Polar (+)

• Uncharged

The phospholipid tail is _____________ & _____________

• Hydrophilic

• Hydrophobic

• Polar (+)

• non-polar

Small, nonpolar, hydrophobic molecules such as fatty acids

• easily pass through the membrane's bilayer

• very slowly diffuse through the bilayer

• require transport proteins

• enter through endocytosis

What is the definition of Equilibrium?

• the process that brings LARGE particles INTO the cell through the cell membrane
  
• The movement of molecules from an area of high concentration (where the molecules are more crowded together) to a area of low concentration (where molecules are more spread apart)
  
• the state where molecules are equally concentrated (balanced) on both sides of the cell membrane.
  
• the movement of WATER molecules across the cell membrane.
  

Tags

NGSS.HS-LS1-3

What is the definition of  Selective Permeability?

• The movement of materials across the cell membrane that requires NO ENERGY from the cell.
  
• The movement of materials through (or across) the cell membrane
  
• The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.
• The movement of molecules from an area of high concentration (where the molecules are more crowded together) to a area of low concentration (where molecules are more spread apart)
  

Tags

NGSS.HS-LS1-3

The cell membrane is selectively permeable, which means...

• All materials can enter and leave the cell
• Certain things can enter while others cannot
• The cell manually sorts through all materials
• Only certain cells can interact with the cell.

Which type of biological macromolecule is the main component of the plasma membrane?

• carbohydrate

• lipid

• protein

• nucleic acid

What type of transport uses a transport protein?

• Osmosis

• Facilitated diffusion

Passive Transport

• Does require cell energy

• Does NOT require cell energy

The diagram shows a cell membrane composed of a phospholipid bilayer with a channel protein. Each x represents the same type of molecule inside or outside the cell. Facilitated diffusion moves these molecules across the cell membrane

• out of the cell through the phospholipid bilayer,

• out of the cell through the channel protein.

• into the cell through the phospholipid bilayer.

• into the cell through the channel protein.