Cell Transport

What is the primary structural component of the cell membrane?

• Protein channels

• Genetic material

• Phospholipid bilayer

• Ribosomes

Which type of transport allows small, non-polar molecules like oxygen and carbon dioxide to pass directly through the cell membrane without requiring energy?

• Facilitated diffusion

• Active transport

• Simple diffusion

• Endocytosis

What is a key difference between simple diffusion and facilitated diffusion?

• Simple diffusion requires ATP, while facilitated diffusion does not.

• Facilitated diffusion requires a transport protein, while simple diffusion does not.

• Simple diffusion moves against the concentration gradient, while facilitated diffusion moves with it.

• Facilitated diffusion only transports non-polar molecules, while simple diffusion transports polar molecules.

What characteristic defines active transport?

• It moves molecules from a high concentration to a low concentration.

• It does not require any energy input.

• It moves molecules against their concentration gradient and requires energy.

• It only transports small, non-polar molecules.

What is the difference between endocytosis and exocytosis

• Materials exit the cell during endocytosis and enter during exocytosis

• Materials use energy during endocytosis but no energy is used during exocytosis.

• Materials use energy during exocytosis but not energy is used during endocytosis.

• Materials enter the cell during endocytosis and exit the cell during exocytosis.