Cell Transport Quiz
Questions: 16 · 10 minutes
1. An intestinal cell uses the sodium gradient established by another pump to bring glucose into the cell with sodium. How should this glucose movement be classified?
Simple diffusion
Primary active transport
Secondary active transport
Phagocytosis
2. An animal cell is placed in a solution with a higher effective solute concentration than its cytoplasm. What will most likely happen?
Solute will leave the cell until the cell bursts.
Water will leave the cell, causing it to shrink.
Water will enter the cell, causing it to swell.
There will be no movement of water molecules across the membrane.
3. A cell can no longer make enough ATP, so an ATP-powered ion pump slows markedly. What is likely to happen over time?
The pump switches to simple diffusion while maintaining the same gradient.
The ion gradient becomes steeper because fewer ions cross the membrane.
All membrane transport stops immediately.
The ion gradient maintained by the pump gradually weakens.
4. What is happening to water molecules when a cell is in an isotonic environment?
Water enters the cell but does not leave it.
Water moves in both directions, with no net movement overall.
Water stops crossing the membrane because equilibrium blocks molecular motion.
Water leaves the cell but does not enter it.
5. A gland cell packages a hormone in a vesicle. The vesicle fuses with the plasma membrane and releases the hormone outside. Which process occurred?
Pinocytosis
Osmosis
Facilitated diffusion
Exocytosis
6. An ion moves down its electrochemical gradient through an open membrane channel without ATP being used. How is it transported?
Simple diffusion through the lipid bilayer
Facilitated diffusion
Exocytosis
Primary active transport
7. A white blood cell surrounds and internalizes a bacterium in a large vesicle. Which process is this?
Phagocytosis
Receptor-mediated exocytosis
Facilitated diffusion
Osmosis
8. What is osmosis?
The movement of solute through a protein pump using ATP
The release of large molecules when a vesicle joins the membrane
The net movement of water across a selectively permeable membrane
The uptake of extracellular material into a membrane-bound vesicle
9. Oxygen is more concentrated outside a cell than inside it and passes directly through the lipid bilayer. Which transport process is occurring?
Primary active transport
Facilitated diffusion
Simple diffusion
Receptor-mediated endocytosis
10. Which process describes the net movement of particles from an area of higher concentration to an area of lower concentration?
Active transport
Endocytosis
Diffusion
Exocytosis
11. A carrier-mediated transport system is tested as the external solute concentration rises. The transport rate increases at first and then levels off. What best explains the plateau?
The membrane has become completely impermeable to water.
The available carrier proteins are operating near their maximum capacity.
The solute has permanently depleted the cell's phospholipids.
The concentration gradient has stopped affecting particle movement.
12. A drug blocks a membrane ion channel. The ion normally moves through that channel down its electrochemical gradient. What is the most immediate expected effect?
Facilitated diffusion of the ion through that channel decreases.
The ion begins crossing the lipid bilayer at the same rate.
The ion is automatically moved by exocytosis instead.
Osmosis permanently stops across the entire membrane.
13. Four cells have the same membrane properties but different surface-area-to-volume ratios. Which cell can generally exchange materials most rapidly relative to its volume?
The cell with the highest surface-area-to-volume ratio
The cell with the lowest surface-area-to-volume ratio
The cell with the greatest volume, regardless of surface area
The cell with equal numerical values for surface area and volume
14. The sodium-potassium pump directly uses energy from ATP to move ions against their gradients. What type of transport is this?
Facilitated diffusion
Osmosis
Secondary active transport
Primary active transport
15. A healthy plant cell is placed in a hypotonic solution. What is the most likely result?
Water enters, and the cell becomes turgid as the wall resists expansion.
The cell wall dissolves as solute enters by diffusion.
The cell loses water and its membrane pulls away from the cell wall.
The cell immediately stops all transport to prevent swelling.
16. Which statement best distinguishes active transport from passive transport?
Active transport uses only channel proteins, while passive transport uses only carrier proteins.
Active transport always moves water, while passive transport moves solutes.
Active transport occurs only in animal cells, while passive transport occurs in all cells.
Active transport can move a substance against its electrochemical gradient by using an energy source.