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Annette observed that if she put salad dressing on her salad in the morning before leaving home, by lunch time she found excess liquid in her container and the greens were wilted. Why does this happen?
A) Condensation from the refrigerator accumulates in the salad container.
B) The dressing creates a hypertonic solution around plant cells, which causes water to diffuse out of the cell plasmolysing the cells.
C) The dressing creates an isotonic solution around plant cells, which causes water to diffuse into and out of the plant cells making them flaccid.
D) The dressing creates a hypotonic solution around plant cells, which causes water to diffuse into the cell creating an increase in turgor pressure.
2)
Your science teacher has asked the class to make a cell city model. Which building or business in the city could represent the mitochondria, and why?
A) city dump - waste storage
B) city hall - control center
C) roads - transportation system
D) power company - produces energy
3)
Proteins destined for extracellular release are packaged in specific vesicles. After packaging, the vesicles bud off and are stored in the cell until a signal is given for their release. When the appropriate signal is received they move towards the membrane and fuse to release their contents.
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