- The process shown is Exocytosis. The description should read: "A process in which a cell releases materials to the outside by fusing a vesicle with its plasma membrane and expelling the material."
- The steps are numbered correctly as 1, 2, 3 from left to right, showing the vesicle moving toward, fusing with, and releasing its contents at the plasma membrane.
- For the Sodium Potassium Pump diagram, the pump uses ATP to move 3 sodium ions out of the cell and 2 potassium ions into the cell against their concentration gradients.
- In the Cell Environments section, the hypotonic environment has fewer solutes outside than inside, causing water to flow into the cell; hypertonic has more solutes outside, causing water to flow out; isotonic has equal solute concentrations, so no net water movement occurs.
- Osmosis involves water moving across a membrane from low solute concentration to high solute concentration; simple diffusion moves small nonpolar molecules directly through the membrane; facilitated diffusion uses carrier proteins or ion channels for larger or polar molecules without energy input.
Parent Tip: Review the logic above to help your child master the concept of active transport worksheet answers.
