Unit 2 Target 4: Cell Membrane And Homeostasis
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- 1.The plasma membrane
- A.
Encloses the contents of a cell.
- B.
Allows material to enter and leave the cell.
- C.
Is selectively permeable.
- D.
All of the above.
- 2.An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes
- A.
Water to move into the cell.
- B.
Water to move out of the cell.
- C.
Solutes to move into the cell.
- D.
Solutes to move out of the cell.
- 3.Which of the following structures serves as the cell's boundary from its environment?
- A.
Mitochondrion
- B.
Cell membrane
- C.
Chloroplast
- D.
Channel proteins
- 4.Which of the following is a function of the cell membrane?
- A.
Breaks down lipids, carbs, and proteins from food
- B.
Stores water, salt, proteins, and carbs
- C.
Keeps the cell wall in place
- D.
Regulates which materials enter and leave the cell
- 5.When the concentration of molecules on both sides of a membrane is the same (Isotonic solution), the molecules will
- A.
Move across the membrane to the outside of the cell.
- B.
Stop moving across the membrane.
- C.
Move across the membrane in both directions.
- D.
Move across the membrane to the inside of the cell.
- 6.A scientist places a cell in a solution, and over time the cell gains mass and swells. What is the most likely explanation for the cell’s gain in mass?
- A.
The solution is hypertonic to the cell.
- B.
The solution and the cell have equal concentrations of solutes.
- C.
The solution is hypotonic to the cell.
- D.
The solution and the cell have equal concentrations of water.
- 7.Biochemists have created an artificial cell membrane that they hope to insert into artificial red blood cells for future dehydration and transportation into outer space.When scientists stain natural cell membranes with a heavy metal, they can view the membranes with an electron microscope. The heavy metal stains the nonpolar hydrophobic tails of phospholipid membranes. If the artificial membranes resemble natural membranes, what area(s), when viewed under a microscope, would appear stained? (Note: Shading represents stains.)
- A.
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- B.
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- C.
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- D.
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