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
- 90 ATP and 60 potassium ions
- 30 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
- Oxygen crossing stopped without ATP, but pumping continued
- Pumping stopped without ATP, so the pumps must have run out of potassium ions
- Pumping stopped without ATP, but crossings that need no ATP continued
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?
- Pumps moved potassium ions from where there are more to where there are fewer
- Channel proteins let potassium ions flow in, powered by ATP
- It used ATP to pump potassium ions toward the side with more
- Pumps moved potassium ions in using the concentration difference
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?
- Vesicles form on their own, so the 0 rows must be errors
- The particles came in by exocytosis, which stopped without ATP
- Vesicle uptake takes energy, but oxygen crosses down its gradient with none
- Oxygen crossing needs ATP too, so the 18 must be an error
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 3 sodium ions out for 3 potassium ions in
- 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 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 does move 3 sodium ions out and 2 potassium ions in, but each cycle uses ATP
- 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 moves 3 sodium ions out and 2 potassium ions in, and needs ATP on steep gradients
Use this
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 takes in small particles, and endocytosis takes in large ones
- Exocytosis releases vesicle contents outside, and endocytosis takes particles in
- Exocytosis takes particles in, but it uses a vesicle to do it
- Exocytosis releases vesicle contents outside, and it needs no energy
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 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 membrane proteins are powered by ATP
- P can add potassium ions to the cell, because ATP lets it move them toward the side with more
Membrane drawing (model, not to scale). A gland cell's Golgi apparatus packaged an enzyme into a secretory vesicle. Milo must pick the best claim, with its reason, about the 12 enzyme molecules in vesicle V of a gland cell.
- They will leave by endocytosis, because the vesicle fuses with the membrane and releases them
- They will leave by phagocytosis, because the vesicle engulfs a large particle and carries it out
- They will leave by exocytosis, because vesicles drift out with no energy needed
- They will leave by exocytosis, because the vesicle fuses with the membrane and releases them
Membrane drawing (model, not to scale). Zee must pick the best claim, with its reason, about proteins P and G in the drawing.
- P is primary active transport and G is secondary, because G runs on the gradient P builds
- P and G are both secondary active transport, because neither needs energy
- G is primary active transport and P is secondary, because G uses the ATP that P splits
- P and G are both primary active transport, because both use ATP directly
