Active transport: pumps and vesicles
Grade 9 Science Worksheet - Challenge Me
Circle the best answer.
Read this first
Use the table
Lab card (model data) and drawing, not to scale. The card gives counts for pump P in one cell.
Minutes ATP used Sodium ions moved out Potassium ions moved in 5 8 24 16 10 15 45 30 15 21 63 42 Drawing: letter P points to a protein that reaches all the way across the bilayer, with an ATP label beside it. The card is read about only: a teacher counted the ions, and no one handled anything.
Bo reads the card for pump P. If the pattern continues, how many ATP has P used when 90 sodium ions have moved out, and how many potassium ions have moved in?
- 45 ATP and 135 potassium ions
- 30 ATP and 45 potassium ions
- 30 ATP and 60 potassium ions
- 90 ATP and 60 potassium ions
The test was read about only: a teacher ran it, and no one handled the cell. Luz reads a teacher’s lab card about a cell treated so it cannot make ATP. Which conclusion does the card support?
- Crossings through proteins stopped without ATP, because proteins use ATP
- Pumping stopped without ATP, but crossings that need no ATP continued
- Oxygen crossing stopped without ATP, but pumping continued
- Pumping stopped without ATP, so the pumps must have run out of potassium ions
The test was read about only: a teacher ran it, and no one handled the plant. Noah reads the card about a root hair cell. Why did the normal cell take in potassium ions even though it already held far more than the soil water?
- Channel proteins let potassium ions flow in, powered by ATP
- Pumps moved potassium ions in using the concentration difference
- It used ATP to pump potassium ions toward the side with more
- Pumps moved potassium ions from where there are more to where there are fewer
The test was read about only: a teacher ran it, and no one handled the cell. Ari sees the vesicle rows fall to 0 but the oxygen row stay at 18. Which reason explains the odd pattern?
- Oxygen crossing needs ATP too, so the 18 must be an error
- The particles came in by exocytosis, which stopped without ATP
- Vesicle uptake takes energy, but oxygen crosses down its gradient with none
- Vesicles form on their own, so the 0 rows must be errors
Use the table
Lab card (model data) and drawing, not to scale. Pump P in one cell runs 10 cycles with enough ATP; it sits in a bilayer.
Time Sodium ions outside Potassium ions inside start 40 30 after 10 cycles 70 50 Drawing: letter P points to a sodium-potassium pump with an ATP label beside it. The card is read about only: a teacher counted the ions, and no one handled anything.
Jun sees sodium ions outside rise by 30 but potassium ions inside rise by only 20. Which reason fits the card?
- Each cycle moves 2 sodium ions out for 3 potassium ions in
- Both ions moved down their gradients, so the counts differ
- Each cycle moves 3 sodium ions out for 3 potassium ions in
- Each cycle moves 3 sodium ions out for 2 potassium ions in
Use this
Membrane drawing (model, not to scale). A bilayer: a top row of round heads, tails meeting in the middle, and a bottom row of round heads, with watery fluid outside the cell above and watery fluid inside the cell below. Letter P points to a sodium-potassium pump with an ATP label beside it. Arrows show 3 sodium ions moving out and 2 potassium ions moving in, and 1 ATP being used in the cycle.
Esme’s notes say the sodium-potassium pump moves 3 sodium ions out and 2 potassium ions in, and needs no ATP. Which correction fixes the notes?
- It moves 3 sodium ions out and 2 potassium ions in, and needs ATP on steep gradients
- It moves 2 sodium ions out and 3 potassium ions in, and each cycle uses ATP
- It moves 3 sodium ions in and 2 potassium ions out, and each cycle uses ATP
- It does move 3 sodium ions out and 2 potassium ions in, but each cycle uses ATP
Membrane drawing (model, not to scale). Pia’s notes say exocytosis is how a cell takes a large particle in. Which correction fixes the notes?
- Exocytosis releases vesicle contents outside, and it needs no energy
- Exocytosis releases vesicle contents outside, and endocytosis takes particles in
- Exocytosis takes in small particles, and endocytosis takes in large ones
- Exocytosis takes particles in, but it uses a vesicle to do it
Use this
Membrane drawing (model, not to scale). A bilayer: a top row of round heads, tails meeting in the middle, and a bottom row of round heads, with watery fluid outside the cell above and watery fluid inside the cell below. Letter P points to a pump with an ATP label beside it. Letter C points to a channel protein with a tunnel and no ATP label. Outside the cell: 10 sodium ions. Inside the cell: 2 sodium ions.
Ren’s notes say every protein in a membrane uses ATP, so a cell that cannot make ATP cannot move any ion. Which correction fixes the notes?
- Pumps use ATP to move ions down a gradient, and channels move ions up it
- Pumps use ATP, but channels let ions flow down their gradient with no ATP
- Pumps and channels both use ATP, but pumps use more of it
- Channels use ATP to move ions, and pumps use the gradient
Use this
Membrane drawing (model, not to scale).
Tala must pick the best claim, with its reason, about pump P in a root hair cell and the potassium ions near it.
- P can add potassium ions to the cell, because membrane proteins are powered by ATP
- P can add potassium ions to the cell, because the concentration difference supplies the energy
- P can add potassium ions to the cell, because ions move from the side with more to the side with fewer
- P can add potassium ions to the cell, because ATP lets it move them toward the side with more
Zee must pick the best claim, with its reason, about proteins P and G in the drawing.
- G is primary active transport and P is secondary, because G uses the ATP that P splits
- P is primary active transport and G is secondary, because G runs on the gradient P builds
- P and G are both primary active transport, because both use ATP directly
- P and G are both secondary active transport, because neither needs energy