01
Choose one
1 point
Which description best identifies facilitated diffusion?
Free Practice Quiz Question List
Membranes, Transport, and Cellular Communication Quiz Online Quiz Questions
Use this free practice quiz with 20 questions to review Membranes, Transport, and Cellular Communication, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
An animal cell is placed in a solution with a higher concentration of nonpenetrating solutes than the cell interior. What is the most likely result?
- A
Water enters the cell, causing it to swell.
- B
There is no net water movement, so the cell maintains its volume.
- C
Water leaves the cell, causing it to shrivel.
- D
Solutes enter the cell until it lyses.
03
Choose one
1 point
Which activity is characteristic of the sodium-potassium pump during one typical cycle?
- A
Three Na⁺ ions move out and two K⁺ ions move in per ATP hydrolyzed.
- B
Two Na⁺ ions move out and three K⁺ ions move in per ATP hydrolyzed.
- C
Na⁺ and K⁺ move in the same direction through an open channel.
- D
Na⁺ moves down its gradient and directly powers ATP synthesis at the pump.
04
Choose all
1 point
In an investigation of factors affecting diffusion through identical agar cubes, which two statements describe appropriate experimental choices? Select all that apply.
- A
Temperature can be an independent variable.
- B
Cube dimensions should vary between treatments to create a stronger test.
- C
External concentration can be an independent variable.
- D
Solution volume must be the dependent variable.
05
Choose all
1 point
Which two conclusions or practices are appropriate for a potato-core osmosis investigation? Select all that apply.
- A
A decrease in mass proves that the sample was in an isotonic solution.
- B
A gain in mass indicates net water entry.
- C
The external solution must contain a solute that freely crosses the membrane for tonicity to be predicted.
- D
Replicates improve the reliability of the results.
06
True or false
1 point
True or false: Because hydrogen ions are very small, they can cross the phospholipid bilayer efficiently without membrane proteins.
- A
True
- B
False
07
True or false
1 point
True or false: A sodium-glucose cotransporter can depend indirectly on ATP even though the cotransporter itself does not hydrolyze ATP.
- A
True
- B
False
08
Written response
1 point
What term describes the combined influence of a concentration gradient and an electrical gradient on an ion?
09
Written response
1 point
For each ATP molecule hydrolyzed by the typical sodium-potassium pump, how many Na⁺ ions are moved out of the cell?
10
Fill in the blank
1 point
The fatty-acid tails of phospholipids face one another, forming a core that restricts many ions and polar molecules.
11
Fill in the blank
1 point
Secondary active transport in which two substances move in the same direction is called .
12
Open ended
1 point
Explain how a membrane receptor can convert an extracellular signal into a controlled intracellular response. Include the roles of reception, transduction, response, and termination, and give relevant molecular examples.
13
Choose one
1 point
Potato cores are placed in a series of sucrose solutions. The cores lose mass in the most concentrated solutions. Which explanation best accounts for this result?
- A
The cores gain mass because solute enters faster than water leaves.
- B
The cores lose mass because water exits toward the higher effective solute concentration.
- C
The cores show no mass change because osmosis does not affect plant tissue.
- D
The cores gain mass only if the external solution is hypertonic.
14
Choose one
1 point
In a beet-tissue investigation, equal samples are exposed to different temperatures and the surrounding solutions are measured for pigment. What does greater pigment release most directly indicate?
- A
A decrease in pigment concentration inside the tissue proves that diffusion stopped.
- B
A darker tissue always demonstrates lower membrane permeability.
- C
More pigment in the surrounding solution indicates greater membrane disruption.
- D
The treatment temperature is the dependent variable in this design.
15
Choose one
1 point
Which part of a phospholipid bilayer creates the main hydrophobic barrier that restricts the passage of ions?
- A
The hydrophilic phosphate heads
- B
The hydrophobic fatty-acid tails
- C
The carbohydrate chains of the glycocalyx
- D
The peripheral membrane proteins
16
True or false
1 point
True or false: Signaling by a steroid hormone through an intracellular receptor often produces a slower but longer-lasting response than signaling through a ligand-gated ion channel.
- A
True
- B
False
17
Choose one
1 point
A cell continuously produces carbon dioxide, causing its carbon dioxide concentration to become higher inside the cell than outside. How will carbon dioxide cross the plasma membrane?
- A
Into the cell by facilitated diffusion
- B
Out of the cell by simple diffusion
- C
Out of the cell by primary active transport
- D
Into the cell by secondary active transport
18
Choose one
1 point
A plant cell is placed in a hypotonic solution containing solutes that cannot cross its plasma membrane. What is the most likely result?
- A
Water leaves the cell, causing plasmolysis
- B
There is no net water movement, so the cell remains flaccid
- C
Water enters the cell, producing turgor pressure
- D
Solutes are actively pumped out, causing the cell to shrink
19
Written response
1 point
A potato core has an initial mass of 20 g and a final mass of 25 g after incubation in a solution. What is the percentage change in mass? Enter the value to the nearest 0.1 percentage point; an answer of 25% is expected.
20
Written response
1 point
What term describes the combined influence of an ion's concentration difference and the electrical difference across a membrane?