Unit 1c. Cell Transport Quiz

What is diffusion?

• The movement of water molecules across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.

• The active transport of molecules against their concentration gradient, requiring energy.

• The movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.

• The process by which cells engulf large particles through the cell membrane.

What is osmosis?

• The movement of solutes from an area of high concentration to an area of low concentration.

• The movement of water molecules across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.

• The active transport of ions across a cell membrane.

• The process by which cells release substances to the external environment.

Which of the following is an example of active transport?

• Diffusion of oxygen from a high concentration to a low concentration.

• Osmosis of water from a dilute solution to a concentrated solution.

• The sodium-potassium pump moving ions against their concentration gradient.

• The movement of carbon dioxide out of a cell.

Passive transport includes which of the following processes?

• Endocytosis

• Exocytosis

• Osmosis

• Sodium-potassium pump

What is the main difference between passive transport and active transport?

• Passive transport can only move water, while active transport can move any type of molecules.

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

• Passive transport requires energy, while active transport does not.

• Active transport can only occur in animal cells, while passive transport occurs in both plant and animal cells.

Endocytosis is a process by which a cell:

• Releases substances outside the cell.

• Takes in large particles or liquids from the surrounding environment.

• Expels water to balance solute concentration.

• Moves ions against the concentration gradient without using energy.

Exocytosis is the process by which:

• Cells absorb water to balance solute concentration.

• Cells release substances to the external environment.

• Cells take in large particles by engulfing them.

• Cells move ions against the concentration gradient using energy.

Which condition is necessary for diffusion to occur?

• Presence of a semipermeable membrane.

• Use of cellular energy.

• A concentration gradient.

• Absence of a concentration gradient.

In the context of cell transport, what role does the cell membrane play in passive transport?

• It actively pumps substances across using ATP.

• It serves as a barrier to all substances, preventing transport.

• It selectively allows certain substances to pass through without the use of energy.

• It completely blocks the passage of water molecules.

What is the primary function of the sodium-potassium pump in active transport?

• To facilitate the diffusion of sodium and potassium ions across the cell membrane.

• To maintain the cell's volume by controlling water movement.

• To generate ATP by moving sodium and potassium ions across the cell membrane.

• To maintain a high concentration of potassium ions inside and a high concentration of sodium ions outside the cell.