What is the primary function of the cell membrane?

• To control the movement of substances in and out of the cell

• To provide energy for the cell

• To create proteins

• To replicate DNA

Which of the following best describes the structure of the cell membrane?

• Double layer of carbohydrates

• Double layer of phospholipids with embedded proteins

• Single layer of nucleic acids

• Single layer of proteins

In the fluid mosaic model, which molecule helps the membrane maintain its fluidity?

• Protein

• Phospholipid

• Carbohydrate

• Cholesterol

Which type of cellular transport requires energy?

• Diffusion

• Osmosis

• Facilitated diffusion

• Active transport

What type of transport involves molecules moving from high concentration to low concentration without energy?

• Active transport

• Diffusion

• Exocytosis

• Endocytosis

In osmosis, water moves across a membrane toward an area of:

• Higher water concentration

• Lower water concentration

• Equal water concentration

• No concentration

Which term describes a solution with a higher concentration of solute compared to the cell's interior?

• Hypotonic

• Hypertonic

• Isotonic

• Ionic

What will happen to a cell placed in a hypotonic solution?

• It will shrink

• It will swell and may burst

• It will stay the same

• It will lose water and shrivel

Facilitated diffusion requires:

• ATP

• Transport proteins

• Vesicles

• Sodium-potassium pumps

Which transport protein is involved in moving sodium ions out of the cell and potassium ions into the cell?

• Channel protein

• Transport protein

• Sodium-potassium pump

• Vesicle