01
True or false
1 point
A cell has a higher oxygen concentration inside than outside. Oxygen crosses the lipid bilayer directly from the cell to the outside without the cell spending energy. Is this passive transport?
Free Practice Quiz Question List
3 Cellular Transport Online Quiz Questions
Use this free practice quiz with 20 questions to review 3 Cellular Transport, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
A cell takes up extracellular fluid along with substances dissolved in it. Which process is most directly responsible?
- A
Phagocytosis
- B
Pinocytosis
- C
Receptor-mediated endocytosis
- D
Exocytosis
03
Fill in the blank
1 point
The endocytosis process that engulfs large particles such as microbes is .
04
Written response
1 point
A membrane transporter moves two substances in opposite directions. What is this transport arrangement called?
05
Choose one
1 point
Which description correctly states the action of the sodium–potassium pump during one transport cycle?
- A
One ATP moves two Na⁺ ions out and three K⁺ ions in.
- B
One ATP moves three Na⁺ ions in and two K⁺ ions out.
- C
One ATP moves three Na⁺ ions out and two K⁺ ions in.
- D
One ATP moves equal numbers of Na⁺ and K⁺ ions in opposite directions.
06
Fill in the blank
1 point
When a vesicle fuses with the plasma membrane and releases its contents outside the cell, the process is .
07
True or false
1 point
A polar molecule moves down its concentration gradient through a carrier protein. This movement requires the cell to directly spend ATP. Is this statement true or false?
- A
True
- B
False
08
Choose all
1 point
Which statements about secondary active transport are correct? Select all that apply.
- A
It can use energy stored in an ion gradient.
- B
The ion gradient is usually established by primary active transport.
- C
The transporter must directly hydrolyze ATP for each coupled transport event.
- D
It can drive glucose uptake against glucose's gradient by coupling it to ion movement.
09
Written response
1 point
What is the term for the voltage difference across a cell membrane, often described as the interior's electrical potential relative to the exterior?
10
Choose one
1 point
An ion moves into a cell even though its concentration is already higher inside than outside. The electrical attraction into the cell is strong enough to make the ion's overall electrochemical movement downhill. Which conclusion is correct?
- A
The ion must be undergoing active transport because it moves against its concentration gradient.
- B
The ion can move passively if the electrical force makes its overall electrochemical movement downhill.
- C
The ion must move down its concentration gradient regardless of electrical forces.
- D
The ion can move only if it crosses the lipid bilayer directly.
11
Choose all
1 point
Which statements about the origin or maintenance of membrane potential are correct? Select all that apply.
- A
Unequal ion distributions across the membrane contribute to it.
- B
Selective permeability to ions contributes to it.
- C
It is produced only by the passage of large particles through vesicles.
- D
Potassium leak channels and ion pumps can help establish and maintain it.
12
Open ended
1 point
Explain how passive transport differs from active transport in relation to a substance's gradient and energy use. Include how facilitated diffusion fits into this distinction.
13
Choose one
1 point
Which statement correctly distinguishes a membrane carrier from a channel?
- A
A carrier forms a permanently open pore, while a channel binds each substrate and changes shape.
- B
A channel and a carrier both move only substances against their gradients.
- C
A carrier binds its substrate and changes shape, while a channel provides a passageway for particular substances.
- D
A channel uses ATP to move substances, while a carrier never uses energy.
14
Choose one
1 point
A cell has a higher oxygen concentration inside than outside. Which process can move oxygen directly across the lipid bilayer to the outside without using a membrane protein or cellular energy?
- A
Active transport
- B
Simple diffusion
- C
Facilitated diffusion
- D
Receptor-mediated endocytosis
15
Written response
1 point
A cell forms vesicles to take in extracellular fluid along with substances dissolved in that fluid. What type of endocytosis is occurring?
16
Choose one
1 point
Glucose moves into a cell through a specific carrier protein, from higher to lower glucose concentration. Which transport process describes this movement?
- A
Primary active transport, because glucose uses a carrier
- B
Simple diffusion, because glucose moves down its gradient
- C
Facilitated diffusion, because a carrier helps glucose move down its gradient
- D
Secondary active transport, because all carrier-mediated movement uses energy
17
Written response
1 point
A vesicle inside a cell fuses with the plasma membrane and releases its contents outside the cell. What process is occurring?
18
Choose one
1 point
A membrane protein uses energy from ATP to move Na⁺ out of a cell and K⁺ into it, against their electrochemical gradients. Which category of transport is this?
- A
Primary active transport
- B
Facilitated diffusion
- C
Simple diffusion
- D
Osmosis
19
Choose one
1 point
A selectively permeable membrane separates solutions on sides A and B. A solute that cannot cross the membrane has a higher effective concentration on side A than on side B. In which direction does water move by osmosis?
- A
Water moves toward side B, where the concentration of non-crossing solutes is lower.
- B
Water moves toward side A, where the concentration of non-crossing solutes is higher.
- C
Water moves only toward the side with more total solute, whether or not it can cross.
- D
Water moves only if ATP is used to pump it across.
20
True or false
1 point
An ion can move passively against its concentration gradient if the electrical force makes its overall movement down the electrochemical gradient. True or false?
- A
True
- B
False