Cell Membrane and Transport Quiz

Which of the following is the main component of the cell membrane?

• Cellulose

• Phospholipids

• Nucleic acids

• Glucose

What is the basic structure formed by phospholipids in water?

• Single layer

• Phospholipid bilayer

• Triple helix

• Micelle

Which type of transport requires energy from the cell?

• Passive transport

• Active transport

• Osmosis

• Diffusion

Which process moves molecules from an area of high concentration to an area of low concentration without using energy?

• Endocytosis

• Active transport

• Diffusion

• Exocytosis

Which of the following best describes the function of proteins in the cell membrane?

• They store genetic information.

• They act as channels or carriers for molecules.

• They provide energy for the cell.

• They form the rigid cell wall.

Which statement correctly compares active and passive transport?

• Both require energy from the cell.

• Only passive transport moves substances against the concentration gradient.

• Active transport requires energy, while passive transport does not.

• Both move substances from low to high concentration.

Facilitated diffusion is different from simple diffusion because:

• It requires energy.

• It uses transport proteins.

• It moves molecules against the concentration gradient.

• It only occurs in plant cells.

Which of the following is an example of active transport in cells?

• Osmosis

• Sodium-potassium pump

• Simple diffusion

• Facilitated diffusion

A scientist observes that a cell is using energy to move ions from a low concentration to a high concentration. Which process is most likely occurring, and why?

• Passive transport, because it moves ions with the concentration gradient.

• Active transport, because it moves ions against the concentration gradient using energy.

• Diffusion, because it does not require energy.

• Osmosis, because it involves water movement.

Compare and contrast the processes of osmosis and facilitated diffusion in terms of the substances they transport and the mechanisms involved.

• Both transport water using carrier proteins.

• Osmosis transports water through the membrane, while facilitated diffusion transports other molecules using proteins.

• Both require energy to move substances.

• Facilitated diffusion only occurs in animal cells, while osmosis only occurs in plant cells.