Membrane Transport Mechanisms Quiz

Which of the following is a characteristic of facilitated diffusion?

• It requires energy in the form of ATP.

• It involves the movement of molecules against their concentration gradient.

• It uses transport proteins to move molecules across the cell membrane.

• It is a type of active transport.

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DOK Level 2: Skill/Concept

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

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

• Active transport moves molecules down their concentration gradient, while passive transport moves them against it.

• Active transport involves osmosis, while passive transport involves diffusion.

• Active transport helps the cell exercise and be healthy, passive transport does not.

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DOK Level 2: Skill/Concept

Which of the following best describes the role of amphipathic molecules in the cell membrane?

• They form a rigid structure that prevents any movement of molecules.

• They allow the membrane to be selectively permeable.

• They allow polar and nonpolar molecules to diffuse through the membrane.

• They make sure proteins cannot stay in the membrane.

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DOK Level 2: Skill/Concept

How will a cell placed in a hypertonic solution change?

• The cell will swell from water intake and possibly burst.

• The cell will remain unchanged.

• The cell will shrink as water moves out.

• The cell will become more permeable to ions.

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DOK Level 2: Skill/Concept

Which of the following molecules can diffuse directly through the cell membrane without the aid of transport proteins?

• Glucose

• Sodium ions

• Oxygen

• Proteins

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DOK Level 2: Skill/Concept

Explain why secondary active transport is considered active even though it does not directly use ATP.

• It uses the energy from the hydrolysis of ATP indirectly.

• It relies on the energy stored in the form of a concentration gradient

• It involves the passive movement of molecules.

• It uses energy from sunlight.

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DOK Level 3: Strategic Thinking

Which of the following scenarios best illustrates the concept of facilitated diffusion?

• Water moving through aquaporins in a cell membrane.

• Glucose entering a cell through a glucose transporter protein.

• Sodium ions being pumped out of a cell using ATP.

• Oxygen diffusing directly through the lipid bilayer.

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DOK Level 3: Strategic Thinking

A cell is placed in an isotonic solution. Predict the movement of water across the cell membrane.

• Water will move into the cell, causing it to swell.

• Water will move out of the cell, causing it to shrink.

• There will be no net movement of water.

• Water will move in and out of the cell at different rates.

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DOK Level 2: Skill/Concept

The sodium-potassium pump pumps 3 Na+ ions out of the cell, and 2 K+ ions into the cell, both against their gradient. Select all that are true of Na+/K+ pumps.

• It is an antiporter

• It is a symporter

• It is used in passive transport

• It is used in active transport

• It undergoes a conformational change

Describe the process by which sodium-potassium pumps maintain cell potential.

• They move sodium ions into the cell and potassium ions out of the cell.

• They move sodium ions out of the cell and potassium ions into the cell using ATP.

• They allow sodium and potassium ions to move freely across the membrane.

• They use passive transport to balance ion concentrations.

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DOK Level 3: Strategic Thinking