Cell Transport

Multiple Choice

Which statement best describes the function of the cell membrane?

• It controls what enters and leaves the cell.

• It produces energy for the cell.

• It stores genetic information.

• It breaks down waste products.

Multiple Choice

Why is it important for cells to regulate what enters and exits through their membrane?

• To maintain homeostasis

• To produce energy

• To divide rapidly

• To communicate with other cells

Open Ended

Explain how selective permeability of the cell membrane affects the movement of molecules into and out of the cell.

Multiple Choice

Which of the following best describes "semipermeability"?

• All materials are allowed through the cell membrane

• No materials are allowed through the cell membrane

• Some materials are allowed through the cell membrane while others are blocked.

• The cell membrane does not deal with cell transport.

Fill in the Blank

Fill in the blank: Passive transport does not require ___ to move substances across the cell membrane.

Multiple Choice

Which process involves the movement of molecules from a high concentration to a low concentration without requiring energy?

• Diffusion

• Active transport

• Endocytosis

• Exocytosis

Multiple Choice

What types of molecules are most likely to diffuse through the cell membrane by simple diffusion?

• Small, hydrophobic, and uncharged molecules

• Large, charged molecules

• Proteins and polysaccharides

• Ions and nucleic acids

Multiple Choice

Which of the following statements about osmosis is correct?

• Osmosis is the diffusion of water across a semipermeable membrane.

• Osmosis requires energy input from the cell.

• Osmosis moves molecules against the concentration gradient.

• Osmosis only occurs in plant cells.

Open Ended

Describe what happens to water movement when the concentration of solute outside a cell is different from inside the cell.

Multiple Choice

In which direction do molecules flow for passive transport?

• From an area of high concentration to low concentration.

• Molecules stay put.

• From an area of low concentration to high concentration.

• Only large, charged molecules can pass through to the inside of the membrane.

Multiple Choice

Which of the following is NOT a type of active transport?

• Protein pumps

• Exocytosis

• Osmosis

• Endocytosis

Fill in the Blank

All types of active transport require ___ to move molecules across the membrane.