Biology Quiz

What role do membrane proteins play in facilitated diffusion?

• They provide energy for the movement of molecules.

• They act as channels to help molecules cross the cell membrane.

• They prevent molecules from entering the cell.

• They dissolve molecules in the extracellular fluid.

Facilitated diffusion occurs in which part of the cell?

• Nucleus

• Mitochondria

• Cell membrane

• Ribosome

Which of the following is NOT true about facilitated diffusion?

• It requires energy.

• It involves membrane proteins.

• It moves molecules across the cell membrane.

• It is a passive transport process.

Facilitated diffusion is an example of what type of transport?

• Active transport

• Passive transport

• Bulk transport

• Osmosis

In facilitated diffusion, what is the direction of molecule movement?

• From high to low concentration

• From low to high concentration

• Randomly in all directions

• Only into the cell

Which of the following best describes the function of channel proteins in facilitated diffusion?

• They break down molecules.

• They provide a passageway for molecules.

• They store energy.

• They synthesize proteins.

Which of the following statements about facilitated diffusion is correct?

• It is an energy-consuming process.

• It requires the use of vesicles.

• It involves the use of carrier or channel proteins.

• It moves molecules from low to high concentration.

What is the primary function of facilitated diffusion in cells?

• To generate energy

• To transport molecules across the cell membrane

• To synthesize proteins

• To break down waste products

Which of the following does NOT assist in simple diffusion?

• Proteins

• Energy

• Concentration gradient

• ATP

Which of the following is true about simple diffusion?

• It requires energy

• It requires proteins

• It occurs without energy or proteins

• It moves molecules against the concentration gradient