Cell Transport

Which of the following describes continuous particle movement with no overall change in concentration?

• Concentration gradient equilibriumSelective permeability
• Dynamic equilibrium
• Facilitated diffusion
• selective permeability 

The gradual difference in concentration of a substance throughout a space is called

• Diffusion
• Concentration gradient
• Selective permeability
• Dynamic equilibrium

The amount of a substance in an area is

• Permeability
• Homeostasis
• Concentration
• Equilibrium

A cell’s stable internal balance is

• Concentration
• Permeability
• Equilibrium
• Homeostasis

Only certain molecules are permitted to pass through the cell membrane due to

• Equilibrium
• Permeability
• Selective permeability
• Impermeability

Cholesterol serves what critical function in the body?

• Allows water to enter the cell
• Sends signals
• Identifies the cell
• Increases fluidity of the plasma membrane

Which of the following is an example of passive transport?

• Movement in vesicles
• Exocytosis
• Sodium-potassium pump
• Osmosis

What describes transport proteins moving molecules across the plasma membrane?

• Active transport
• Osmosis
• Facilitated diffusion
• Diffusion

As a result of diffusion, the concentration of many types of substances

• Becomes imbalanced on both sides of a membrane
• Always remains greater inside a membrane
• Eventually becomes balanced on both sides of a membrane
• Always remains greater on the outside of a membrane

How does particle size affect a molecule’s transport across a cell membrane? 

• Particle size does not affect a molecule’s transport across the cell membrane.
• It is easier for small molecules to diffuse across the cell membrane.
• It is easier for large molecules to diffuse across the cell membrane.
• Macromolecules are able to easily move across the cell membrane because they are so big.