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The Cell Membrane (Grades 11-12)

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The Cell Membrane

Which 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
Explain the plasma membrane.

What is the main function of a selectively permeable membrane?
  1. store water
  2. store chemicals
  3. break down molecules within the cell
  4. regulate what enters and leaves the cell
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
In a cell, water always moves to reach an equal concentration on both sides of the membrane.
  1. True
  2. False
What are the two types of transport proteins? Explain how they allow materials to cross the plasma membrane.

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
What are the two parts of the cell membrane that serve as sites of cell recognition?
  1. peripheral and integral membrane proteins
  2. amino acids and lipids of the membrane
  3. glycolipids and glycoproteins of the membrane
  4. hydrophilic and hydrophobic ends of the membrane lipids
Plasmodesmata are the structures found in                  cell membranes that allow for intra and intercellular communication.
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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