⚙️ Active Transport & Membrane Movement
Explore how cells move substances against concentration gradients using energy, and compare this with passive transport. This quiz covers ATP-driven active transport, carrier proteins, the sodium-potassium pump, and real-world examples in living systems. **What you'll learn:** - How active transport differs from passive transport (diffusion and osmosis) - The role of ATP and carrier proteins in moving substances uphill - Why cells invest energy in selective membrane transport - Real-world examples of active transport in plant and animal cells
Questions in this quiz
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- Question 1
What is the primary difference between active transport and passive transport across a cell membrane?
- Question 2
Osmosis is a form of passive transport because water moves across the cell membrane without direct cellular energy expenditure.
- Question 3
Which of the following is the primary energy source that powers active transport in cells?
- Question 4
In the sodium-potassium pump (Na⁺/K⁺-ATPase), what is being transported against the concentration gradient?
- Question 5
Carrier proteins change shape when bound to molecules during active transport, allowing them to move substances across the membrane.
- Question 6
Why do plant root cells require active transport to absorb mineral ions from the soil?
- Question 7
What is a key disadvantage of active transport compared to passive transport?
- Question 8
Diffusion is an example of passive transport because molecules move from areas of high concentration to areas of low concentration without direct cellular energy input.
- Question 9
How does the hydrolysis of ATP (breaking the bond between phosphate groups) provide energy for active transport?
- Question 10
Which of the following is an example of active transport occurring in animal nerve cells?
- Question 11
A cell can survive indefinitely if its active transport processes are blocked, as long as passive transport continues.
- Question 12
What is the relationship between the concentration gradient and the energy requirement of active transport?
- Question 13
Why do cells benefit from investing energy into active transport rather than relying solely on passive transport?
- Question 14
Channel proteins and carrier proteins perform the same function during active transport.
- Question 15
Which statement best explains why the sodium-potassium pump is vital to animal cell survival?
- Question 16
In what way does the structure of a carrier protein enable it to perform active transport?
- Question 17
If a cell's mitochondria are damaged and ATP production decreases, active transport across the cell membrane will be significantly impaired.