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The Cell Membrane (Grades 11-12)

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The Cell Membrane

1. 
Which of the following is a function of the plasma membrane?
  1. breaks down lipids, carbohydrates, and proteins from foods
  2. stores water, salt, proteins, and carbohydrates
  3. keeps the cell wall in place
  4. regulates which materials enter and leave the cell
2. 
Explain the plasma membrane.



3. 
What is the MAIN function of a selectively permeable membrane?
  1. storage of water
  2. storage of chemicals
  3. breaks down molecules within the cell
  4. regulates what enters and leaves the cell
4. 
The plasma membrane is described as being fluid mosaic. What does this mean?
  1. This means that the plasma membrane has only membrane proteins and it is watery
  2. This means that the plasma membrane has different types of phospholipids, which are hydrophilic
  3. This means that the plasma membrane is made of water that has phospholipids that float in it
  4. This means that proteins, which are embedded in the plasma membrane, are able to drift about in the membrane
  5. This means that plasma membrane produces a large amount of water
5. 
In a cell, water always moves to reach an equal concentration on both sides of the membrane.
  1. True
  2. False
6. 
What are the two types of transport proteins? Explain how they allow materials to cross the plasma membrane.



7. 
What structure allows the plasma membrane to be attached to fibers in the extracellular matrix (ECM) and to microfilaments in the cell's cytoplasm?
  1. aquaporin
  2. collagen fiber
  3. connecting glycoprotein
  4. integrin
  5. none of the above
8. 
What are the two parts of the cell membrane that serve as sites of cell recognition?
  1. the peripheral and integral membrane proteins
  2. the amino acids and lipids of the membrane
  3. the glycolipids and glycoproteins of the membrane
  4. hydrophilic and hydrophobic ends of the membrane lipids
9. 
Plasmodesmata are the structures found in                  cell membranes that allow for intra and intercellular communication.
10. 
Which type of protein could be most easily removed from the cell membrane during a laboratory experiment?
  1. integral proteins
  2. channel proteins
  3. gated channel proteins
  4. peripheral proteins
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