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- 1. Multiple Choice
what happens to the membrane of a vesicle after exocytosis
It leaves the cell
It is disassembled by the cell
It fuses and becomes part of the plasma membrane
it is used again in another exocytosis event
- 2. Multiple Choice
In what important way does receptor-mediated endocytosis differ from phagosytosis
it transports only small amounts of fluid
it doesn't involve the pinching off of a membrane
it brings in only a specific targeted molecules
it brings substances into the cell while phagocytosis removes substance
- 3. Multiple Choice
Aldosterone (a steroid hormone), is a small, non polar, hydrophobic molecule that enters a target cell by moving across the plasma membrane down a concentration gradient.
Based on the information presented, how does aldosterone most likely enter target cells?
By simple diffusion
by facilitated diffusion
by active transport
by endocytosis
- 4. Multiple Choice
The model below depicts the movement of several ions and molecules across a cell membrane. For each ion or molecule, the relative concentration on each side of the membrane is shown.
Which of the following statements accurately describes one of the movements shown in the model?
Ca2+ is transported out of the cell by active transport
K+ movement out of the cell requires ATP hydrolysis
Glucose movement into the cell requires ATP hydrolysis
O2 is transported into the cell by active transport
- 5. Multiple ChoiceWhen the concentration of particles inside of a cell is the same as the concentration of particles outside of the cell.active transportconcentrationdiffusionequilibrium
- 6. Open Ended
Kidney cells also have channel proteins like the Ca2+ channel (C in Figure 1) that transports Ca2+ from Region I into the kidney cell. A model representing the exchange of various ions between the kidney cell and the two extracellular regions is shown in Figure 1.
Describe the characteristics of the Ca2+ ions and the plasma membrane of the kidney cell that prevent the Ca2+ ions from moving from Region I into the kidney cell without the channel labeled C.
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